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Question: will the USDA/APHIS dashboard record how many New World Screwworm (NWS) detections (confirmed animal cases plus confirmed wild-fly trap detections) in the U.S. through Aug. 11?
As of early June the APHIS-relevant count is two confirmed calves in Zavala County, Texas (June 3 and June 5); outcomes below two are only plausible if APHIS later revises/removes a confirmation. Forecasters agree this episode looks less like an isolated import and more like pressure from a Mexico-side front (recent Coahuila detections and large regional case counts), yet differs from a Florida‑2016 scale event so far because only two confirmed animals and no wild-fly trap positives appear on APHIS dashboards through June 7. APHIS/Texas have rapidly imposed movement controls, intense surveillance, and massive sterile‑fly releases, which both raise case-finding probability in the near term and can plausibly suppress biological spread. Given summer seasonality favorable to NWS in south Texas, teams place the mode near the current count or a small contained cluster (a few additional animal or trap detections), assign material probability to a moderate right tail of multiple confirmations, and keep a small tail for a Florida‑like or worse outbreak (>>100). Overall, forecasters give very little weight to a downward revision below two, substantial weight to modest growth, and low but non‑zero probability to large-scale spread by Aug. 11.
Forecast: Probability distribution:
As of 2026-06-07, USDA/APHIS has publicly confirmed 2 U.S. detections (both animal cases) with confirmation dates of June 3 and June 5, 2026. The question resolves on the USDA/APHIS “Confirmed Detections of New World Screwworm” dashboard total through 2026-08-11 (inclusive), counting both confirmed animal cases and confirmed wild-fly trap detections.
Key drivers over the ~65 days remaining:
I overweight Forecasters 1–3 relative to Forecaster 4 because they better reflect (a) aggressive response effects and (b) uncertainty about how many trap detections will actually be confirmed and listed, while still keeping a meaningful right tail. Forecaster 2 seems somewhat tight/narrow (too little probability on ‘only a few more detections’), while Forecaster 4’s median in the ~50s and large mass >100 appears to rely on stronger assumptions about widespread pre-existing infestation and/or many individually listed trap detections than the current evidence supports this early.
My resulting distribution has a median around the mid-teens (consistent with “several additional confirmed detections found during intensified follow-up”), a substantial chance of totals in the 20–60 range if spread is broader than initially apparent, and a small but non-trivial chance of exceeding 100 by Aug 11 if surveillance reveals a much larger outbreak than currently indicated.
An amateur forecast is likely to (i) anchor on the current count of 2 and predict only 2–5, underweighting how intensified surveillance/trapping can quickly add confirmed detections, or (ii) extrapolate early detections into a near-exponential outbreak without accounting for rapid sterile-insect + movement-control response capacity. My forecast explicitly mixes containment and wider-outbreak scenarios, preserves a right tail (including some chance of >100), but keeps the median in a range more consistent with aggressive early response and the short (~2-month) window. I’m moderately confident this is better calibrated than a single-scenario extrapolation.
Forecast rationale (numeric):
— Iteration 1 — Across the forecasts, the core view is that the count will rise above the current 2 confirmed detections, but is more likely to remain a relatively contained cluster than become a large-scale outbreak.
Overall, the forecasts suggest USDA will likely list more than 2 confirmed cases/detections by August 11, 2026, probably in a modest cluster of roughly 10–30, driven by local spread and improved detection. At the same time, the outlook remains highly uncertain because a larger outbreak cannot be ruled out if the parasite becomes established in wildlife or spreads beyond the initial containment area.
— Iteration 2 — Across the forecasts, the shared view is that the current situation starts from a very low base — only 2 confirmed detections — but the next 65 days still leave enough time for additional animal cases and wild-fly trap detections to be found. The main reasoning pattern is:
Overall, the forecasts converge on a small but real chance of additional confirmed screwworm cases/detections, with the most likely final total still relatively modest, but with a long upper tail if monitoring uncovers broader spread.
— Iteration 3 — Across the forecasts, the core reasoning is that USDA’s count by Aug. 11, 2026 will likely start from the current small baseline of confirmed cases and then be shaped by two opposing forces:
The shared forecast logic is: a small but real outbreak has likely begun, intensive monitoring will uncover some additional cases and wild-fly detections, but containment efforts make a very large confirmed count unlikely by Aug. 11. The main uncertainty is not whether the count rises at all, but whether it stays in a modest range or jumps if surveillance finds a broader wildlife- or trap-detected spread.
Summary of Forecaster Reasoning
Forecasting the total number of confirmed New World screwworm (NWS) animal cases and wild-fly detections requires balancing the pest’s rapid biological spread against the USDA’s immediate and aggressive eradication efforts.
Initial Outbreak and Environmental Factors The initial discovery of two calf cases several miles apart in Zavala County, Texas, indicates a locally reproducing wild-fly population rather than a single isolated introduction. Unlike the 2016 Florida Keys outbreak—which occurred on an isolated island chain and went undetected for months—South Texas is a contiguous mainland environment. It features high densities of susceptible hosts, including commercial cattle, white-tailed deer, and feral swine, which can act as difficult-to-track reservoirs for the parasite. However, the extreme dry heat of the South Texas summer acts as a double-edged sword: while the warmth accelerates the fly’s life cycle, the brutal temperatures and dry soil also increase pupal desiccation and suppress adult fly lifespan, providing a natural bottleneck to spread.
Containment and the Sterile Insect Technique (SIT) The most significant factor limiting outbreak growth is the USDA’s rapid intervention. The prompt deployment of the Sterile Insect Technique (SIT)—dropping millions of sterile flies weekly into the quarantine zone—is historically proven to be overwhelmingly effective. Forecasters heavily agree that this massive sterile-to-wild ratio will likely crash the local wild-fly population within a few generations, sharply halting the exponential growth of new cases well before the August resolution date.
Surveillance Mechanics and Reporting Lags The final count relies on two metrics: confirmed animal cases and wild-fly trap detections.
Key Uncertainties and Tail Risks The primary risk of a larger, prolonged outbreak stems from two factors: undetected spread among highly mobile feral wildlife (like wild hogs) and the continuous threat of cross-border fly migration from heavily infested regions in Mexico. If the continuous influx of flies from Mexico overwhelms early SIT efforts or establishes undetected clusters outside the initial quarantine zones, ongoing trap detections and wildlife cases could drive the final count significantly higher.
Question: How many confirmed U.S. New World screwworm animal cases and wild-fly detections will USDA list by August 11, 2026? Final Prediction: Probability distribution:
Total Cost: extra_metadata_in_explanation is disabled Time Spent: extra_metadata_in_explanation is disabled LLMs: extra_metadata_in_explanation is disabled Bot Name: extra_metadata_in_explanation is disabled
Forecaster 1: Probability distribution:
Forecaster 2: Probability distribution:
Forecaster 3: Probability distribution:
The research summarizes the June 2026 emergence of New World screwworm (NWS) in the U.S.: two confirmed bovine cases in Zavala County, Texas (June 3 and June 5, 2026), noted against a large outbreak in Mexico (>26,000 cases since late 2024, ~1,882 active cases as of June 2026). It reviews historical U.S. base rates—Florida 2016–2017 (145 total cases, eradicated in ~6 months using ground-released sterile flies and intensive surveillance) and major Texas outbreaks in the 1960s–1970s (including a 1972 cohort of ~95,600 cases and very large 1976 losses). The research details current U.S. response capacity (aerial releases of ~4 million sterile flies/week with capacity targets up to 500 million/week, >113 NWS traps deployed, thousands of supplemental traps, wildlife and livestock inspections, quarantine/movement controls around a 20 km infested zone) and notes key uncertainties (wildlife reservoir status, exact trap-counting protocols, weather, and detection paradox from intensified surveillance).
Using those base rates, surveillance context, and three regime-change scenarios (rapid containment like Florida 2016, regional spread like 1970s Texas, and a slower endemic pattern), the research provides quantitative benchmarks for the 65-day window to August 11, 2026. Rate-based comparisons yield a broad set of projections: conservative containment scenarios produce roughly 25–100 total detections (animal cases plus wild-fly trap positives), central estimates cluster around 75–150 detections, while pessimistic regional-spread scenarios span into the hundreds (150–800+). The research highlights that inclusion of wild-fly trap detections and intensified surveillance will likely increase apparent counts and recommends a reference-class centered on the Florida 2016 outbreak adjusted upward for Texas’ larger wildlife/livestock populations and proximity to Mexican cases; an overall “reasonable forecast range” offered is 25–250 total confirmed U.S. detections by August 11, 2026, with a central tendency around 75–150.
Sources cited in the research (as referenced by bracketed notes in the original document) include official agency reports and historical outbreak records; key organizations referenced were:
Confirmed U.S. Detections:
Context: The outbreak occurs against a backdrop of over 26,000 confirmed NWS cases in Mexico since late 2024, with 1,882 active cases as of June 2026 [6]. The nearest Mexican detection was reported at 25-70 miles south of the Texas border [5][6].
Timeline and Scale:
Response Scale:
Key Characteristics:
1972 Outbreak (Largest on Record):
1976 Outbreak:
Eradication Period Context (1962-1982):
Sterile Fly Deployment:
Surveillance Infrastructure:
Quarantine Measures:
Advantages for Containment:
Challenges for Containment:
The question counts BOTH:
This is crucial because:
Following the two confirmed detections, expect:
This creates a “detection paradox”: Better surveillance may reveal more cases that were already present but undetected, making early-stage outbreak appear larger than it actually is in terms of active transmission.
Scenario A: Rapid Containment (Florida 2016 Model)
Scenario B: Regional Spread (Texas 1970s Model)
Scenario C: Slow Burn
Rate-Based Analysis:
From June 7 (question opening) to August 11, 2026 = 65 days (~9.3 weeks)
Florida 2016 outbreak rate (first 2 months, peak detection period):
Conservative containment scenario:
Wider outbreak scenario:
Base rate suggests moderate outbreak most likely: Florida’s 145 cases over 6 months, with most detected early, suggests 50-200 detections over 2 months is a reasonable central estimate
Modern response capabilities favor containment: 2026 surveillance and response infrastructure is dramatically superior to 1970s, making catastrophic outbreak (thousands of cases) less likely
Geographic proximity to Mexico outbreak is concerning: Unlike Florida 2016 (isolated island introduction), Texas faces continuous pressure from 1,882 active Mexican cases nearby
Resolution criteria includes fly traps: This will likely add 10-30% to animal case counts based on Florida precedent
Time horizon is short (65 days): Limits how far outbreak can spread geographically even in adverse scenario
Two cases already detected suggests local establishment: Not likely to be zero additional cases; the outbreak is real and active
Suggested reference class: Florida 2016 outbreak is the most relevant comparison, adjusted upward for larger geographic area, massive Texas wildlife populations, and inclusion of trap detections in count.
Reasonable forecast range for consideration: 25-250 total confirmed U.S. detections by August 11, 2026, with central tendency around 75-150 detections assuming moderately effective containment similar to Florida 2016 but with larger initial footprint.
I accept the critic’s Round 5 correction partly. I had probably leaned a bit too far into the “exactly 2 / almost nothing further” outcome. The negative-suspect-sample evidence is real, but it is not a structured prevalence survey; it is compatible with a small already-seeded cluster that only becomes visible after intensified inspections. The two confirmed calves being about 5.6 miles apart is still a meaningful warning sign, because it is more consistent with recent local fly activity than with a single isolated intercepted animal. USDA says the second detection followed testing of suspect cases, other surrounding samples were negative, and the second calf was inside the control / enhanced sterile-insect dispersal area, but that evidence should lower—not dominate—the forecast. (direct.aphis.usda.gov)
I continue to defend several downward constraints. The USDA dashboard definition is confirmed-only: it captures individual animal cases, and fly detections are fly traps with at least one wild NWS fly, not every fly, larva, suspect wound, or exposed premises. That makes a raw “biological infections” forecast too high and supports keeping the median far below Florida-style total-case numbers. (direct.aphis.usda.gov) Prior surveillance also matters: USDA reported over 100 NWS-specific traps, thousands of supplemental traps along the southern border, tens of thousands of Cochliomyia flies submitted to NVSL with no NWS detections, and more than 6,600 wild animals examined in high-risk Texas counties with no evidence found. That argues against a broad mature U.S. reservoir as of early June. (direct.aphis.usda.gov)
The new calibration insight is that the process has two lags in opposite directions. Sterile-fly releases began quickly, including aerial releases and ground release chambers, so future reproduction may be suppressed; but infestations seeded before June 4 can still surface in calves, pets, wildlife, or traps during the next few weeks. USDA’s production/dispersal posture is meaningful locally, while still not equivalent to full new domestic production: Pacora is listed as the only currently operational production facility, while Moore production is still under construction, though the Moore dispersal facility is operational. (direct.aphis.usda.gov)
So I am moving upward from my previous round, but not all the way to the critic’s proposed curve. I now put roughly 6–7% on exactly 2, about 18–20% on 2–6, a median in the low-to-mid 20s, around 10% above ~130, and a still-fat far tail for wild-fly/trap regime shift, wildlife discovery, or an independent second U.S. incursion. Conditioned on the question not being annulled:
Updated prediction:
Percentile 0.1: 2.001
Percentile 1: 2.01
Percentile 5: 2.15
Percentile 10: 3.25
Percentile 20: 6.60
Percentile 30: 10.60
Percentile 40: 16.40
Percentile 50: 23.80
Percentile 60: 36.80
Percentile 70: 56.80
Percentile 80: 84.80
Percentile 90: 132.80
Percentile 95: 245.80
Percentile 99: 900.80
Percentile 99.9: 4500.80
Conditioning on non-annulment.
I accept the critic’s latest point that I may have over-weighted the negative surveillance evidence. The 8,000+ traps / 58,000+ fly samples / 19,000+ wildlife specimens are strong evidence against a broad, already-obvious U.S. reservoir, but they are not a perfectly sensitive net over the local Zavala/Uvalde ecology; the two calf detections despite that apparatus show an early local event can be missed until vulnerable animals reveal it. (gov.texas.gov)
I also agree that “two neonatal calf navel cases” cuts both ways. It supports a low-count scenario because these are especially vulnerable sentinels, but two confirmed calves about 5.6 miles apart, with the second found after suspect-case testing, is more than a one-off imported animal story. USDA said the second case was within the established movement-control / enhanced sterile-insect dispersal area and that other surrounding samples had been negative, which keeps me from moving the median too high. (direct.aphis.usda.gov)
The dashboard mechanics remain central: this resolves to confirmed individual animal cases plus fly traps with at least one wild fly detected, not suspect samples, true incidence, or presumptive morbidity. That lowers the median relative to a biological outbreak forecast, but it also leaves a route to a higher dashboard count if trap positives start recurring. (direct.aphis.usda.gov)
I am therefore moving back upward modestly from my previous median of 13.6, but not fully embracing a “many dozens” central case. My best mixture now is: about 20% for final counts around 2–5, 30% for 6–17, 30% for 18–70, and about 10% above 110. I keep a fat far tail because current sterile-fly production is still constrained relative to future planned capacity: Pacora is the only currently operating North American NWS sterile-fly production facility listed by USDA, while Metapa and Moore production facilities are still under construction. (direct.aphis.usda.gov)
Updated prediction:
Percentile 0.1: 1.51
Percentile 1: 1.70
Percentile 5: 2.05
Percentile 10: 2.45
Percentile 20: 4.60
Percentile 30: 7.60
Percentile 40: 11.60
Percentile 50: 16.60
Percentile 60: 26.60
Percentile 70: 42.60
Percentile 80: 67.60
Percentile 90: 110.60
Percentile 95: 245.60
Percentile 99: 950.60
Percentile 99.9: 3300.60
I accept the critic’s main correction: my previous median still treated “two cases 5.6 miles apart” as a stronger signal of a substantial local cluster than it really is. Both confirmed animals were very young calves with navel/umbilical-area vulnerability, which is close to an ideal NWS target. That makes a “small number of fertile females hit a narrow high-risk host cohort” scenario more plausible than I had allowed.
The strongest downward updates for me are:
I still defend keeping a fat right tail. Texas is not the Florida Keys: there is continuous Mexico/border pressure, many susceptible livestock and wildlife hosts, favorable summer biology, and the dashboard includes wild-fly trap detections. USDA also says it is increasing trapping, conducting wildlife surveillance, and maintaining quarantines/movement controls around the detection zones, so surveillance intensity itself can create a burst of confirmed dashboard detections if there is any local reservoir. (direct.aphis.usda.gov)
A new refinement: I now think the distribution should be more “lumpy” than smooth. There is a real low-count administrative/biological containment mode, then a separate trap-schema / discovery-burst mode. If positive traps are logged repeatedly by trap/date, the count can rise into the dozens or low hundreds without a proportional number of animal cases. If traps are effectively deduplicated or remain negative, the official count can stay surprisingly low even if USDA continues intensive response work.
My revised scenario weights are approximately:
So I am moving materially toward the critic: lower median, more mass on single digits / low teens, but preserving the upper tail.
Conditioned on the question not being annulled:
Updated prediction:
Percentile 0.1: 2.001
Percentile 1: 2.03
Percentile 5: 2.22
Percentile 10: 3.05
Percentile 20: 6.1
Percentile 30: 10.3
Percentile 40: 15.4
Percentile 50: 21
Percentile 60: 31
Percentile 70: 49
Percentile 80: 82
Percentile 90: 160
Percentile 95: 330
Percentile 99: 1250
Percentile 99.9: 6000
Modal: 14-27 (25.0%) • partial_shift • 7m36s
Reading: strict
The resolution criteria are narrowly and precisely specified: the resolver must read a specific named dashboard at a specific UTC time, count only confirmed U.S. detections (animal cases + wild-fly trap) with confirmation dates on or before August 11, 2026, excluding Mexico/Central America, human cases, suspects, and non-detection metrics. The fine print explicitly enumerates what is excluded, leaving little room for a broad or charitable interpretation.
Total evidence registered (shared pool): ?
| Variant | Perspective | Model | Turns | Tools | Status |
|---|---|---|---|---|---|
| 0 | inside_view (inside_view_v1) | openai/gpt-5-mini | 25 | 25 | OK |
| 1 | outside_view (outside_view_v1) | anthropic/claude-sonnet-4-6 | 17 | 34 | OK |
| 2 | contrarian (contrarian_v1) | openai/gpt-5 | 9 | 9 | OK |
Evidence confidence: medium
medium evidence]USDA’s immediate SIT sterile fly deployment (8 million flies/week) mirrors the successful 2016 Florida Keys response. If the Texas outbreak is geographically confined to Zavala County and surveillance finds no further cases beyond the initial cluster, detections accumulate slowly or stop. Rapid eradication declaration by USDA would halt new confirmations. Dashboard shows only a handful of additional animal cases and possibly zero wild-fly trap detections.
Open ranchland near the Mexico border provides no natural geographic barrier (unlike the Florida Keys). Livestock movement at ~1.9 km/day could spread larvae before sterile flies suppress the population. The 65-day window to August 11 is long relative to how quickly the situation could grow before SIT takes effect (which typically takes weeks to months).
high evidence]The arrival-forecast projection (mean ~34.5, median ~27, p5–p95 of 5–89) centers in this range. If the outbreak spreads gradually across south Texas ranchland while SIT partially suppresses it, APHIS would confirm a steady stream of animal cases and possibly some wild-fly trap detections over the 65-day window. This is consistent with the 2016 reference-class trajectory (145 cases over ~7 months in a smaller geographic area).
SIT deployment is already underway and could suppress the population before the count climbs this high. If Texas surveillance is highly targeted rather than broad, confirmed detections may be undercounted relative to true spread.
low evidence]If screwworm has already spread more widely than the two Zavala County cases suggest, or if it crossed the Rio Grande from Mexico along a broader front, intensive trapping and surveillance could rapidly reveal a much larger existing population. Wild-fly trap detections could accumulate quickly given 400-mile surveillance radius on the dashboard.
USDA SIT deployment is immediate and large-scale. The detection area is small (~5.6 miles between first two cases). No additional cases confirmed after June 5 as of June 7. Modern SIT has historically contained outbreaks before they reach these scales in the U.S.
low evidence]If the two confirmed cases represent an isolated introduction (e.g., a single border-crossing livestock movement), aggressive SIT plus movement restrictions could prevent any further confirmations. Surveillance finds no additional animal cases and no wild-fly trap detections through August 11.
Two cases 5.6 miles apart over two days suggests a pre-existing local population rather than a single introduction, making additional detections probable. Texas Governor’s disaster declaration implies authorities expect the situation to expand. Surveillance and trapping intensity will increase, raising detection probability even if true spread is limited.
inside_view_v1)Inside View Causal Analysis
Current state: As of June 7, 2026, USDA/APHIS has confirmed exactly 2 U.S. NWS detections (both animal cases in Zavala County, TX), establishing a monotone floor of 2 (per authoritative APHIS sources). No wild-fly trap detections confirmed yet.
Causal chain driving my forecast:
Two cases 5.6 miles apart in 2 days → suggests a pre-existing local population, not a single-animal introduction. This makes the “isolated cluster stays at 2–5” scenario (
relative_evidence_strength: low) unlikely. I weight it at ~8%.USDA’s immediate SIT deployment (8M sterile flies/week) mirrors the 2016 Florida Keys playbook → SIT is effective but takes weeks to months to suppress a population. Over a 65-day window, SIT will likely reduce but not eliminate ongoing detections. The 2016 Florida Keys analogy (145 cases over ~7 months) would project ~55 cases over 65 days, but Texas open ranchland is harder to contain than island geography.
The arrival-forecast projection (
relative_evidence_strength: high): mean ~34.5, median ~27, p5–p95 ~5–89 (source 17). This is the dominant quantitative signal. The projection uses 0.5 detections/day as its rate assumption, which I consider slightly conservative given (a) the Governor’s disaster declaration signals intensive surveillance is coming, (b) wild-fly traps can each add a detection entry when confirmed, and (c) the 65-day window is long.Moderate outbreak scenario (
relative_evidence_strength: high, 15–60 total): The arrival-forecast median ~27 anchors this. Combined with the 2016 reference class and the surveillance intensification factors, I weight the 14–63 detection range heavily (~55% combined mass across bins 2, 3, 4, 5).Large outbreak scenario (
relative_evidence_strength: low, 60–100+): The p95 of ~89 and open-ended upper tail mean some mass goes here, but USDA’s immediate SIT response makes this less probable. ~15% mass total.Bin-by-bin reasoning:
- Below 2 (bin_0): Impossible given monotone floor of 2. ~0%.
- 2–14 (bin_1): “Isolated cluster” or “rapid containment” low end. Two cases 5.6 miles apart suggest more to come; SIT doesn’t work instantly. ~12%.
- 14–27 (bin_2): Lower portion of moderate outbreak. Plausible if SIT is highly effective. ~18%.
- 27–39 (bin_3): Centered on the arrival-forecast median of ~27 and mean of ~34.5. This is the modal outcome. ~22%.
- 39–51 (bin_4): Upper moderate range, within the p5–p95. ~15%.
- 51–63 (bin_5): High moderate, consistent with broader spread + wild-fly trap detections. ~10%.
- 63–76 (bin_6): Approaching large outbreak territory, ~6%.
- 76–88 (bin_7): Large outbreak, below p95. ~5%.
- 88–100 (bin_8): Near top of range, approaching p95. ~7%.
- Above 100 (bin_9): Beyond p95; possible if cross-border reintroductions or surveillance intensity explodes. ~5%.
The high-evidence moderate outbreak scenario dominates. I lean slightly toward the 27–51 range as most probable but maintain meaningful tails in both directions given the genuinely high uncertainty (confidence_in_evidence: medium) and the open-ended dynamic of a novel NWS introduction into U.S. territory after ~60 years.
outside_view_v1)Reference class: early-stage cumulative confirmed detections in recent U.S. New World screwworm events and the arrival-forecast model built from the current 2026 cluster. Base rate: the brief’s arrival-forecast projection (source 17) gives a median ~27 total detections by Aug 11 and a mean ~34.5 (p5–p95 ≈ 5–89). Adjustment: small downward tilt vs. that projection because USDA/APHIS immediately deployed large SIT releases (8M sterile flies/week; source 13) and because the dashboard updates only twice/week (source 14), which slows confirmed additions; net adjustment kept well under ±15 percentage points of mass from the projection’s central tendency. Final shape and justification: I treat the arrival-forecast as the primary quantitative anchor (the brief marked that projection as a strong quantitative input), and therefore concentrate most mass in the mid-double-digit bins that contain the projection’s median/mean: bins covering 14–63 (bin_2 through bin_5) receive ~75% total mass. That reflects the brief’s explicit scenario tagging: the “Moderate outbreak — mid double-digit detections (15–60)” scenario was tagged high evidence and thus carries materially more weight (centered on bins bin_2–bin_4) while the “Rapid containment — low single-digit to low double-digit (3–15)” scenario (relative_evidence_strength: medium) gets a nontrivial allocation in 0.15 (bin_1). Low-evidence tails (large outbreak / near-or-above-100) receive small mass (bins bin_6–bin_8 together ~0.10; bin_9 set to 0 because the brief treated >100 as low evidence and the open upper bound and biological/response context make >100 by Aug 11 unlikely). I set bin_0 to 0.0 because USDA/APHIS already had 2 confirmed detections as of June 7 (authoritative floor; sources 1, 2, 16), so values below 2 are impossible. Specific citations used to shape weights: arrival-forecast projection (source 17 — treated as high-weight quantitative evidence), USDA SIT deployment and response playbook (source 13 — reason to trim high tail), dashboard update cadence and how detections are listed (sources 14, 19–21 — informs how quickly confirmed counts will appear), and the brief’s scenario evidence-strength tags (I followed its high / medium / low weights explicitly). This distribution is an outside-view forecast anchored on the projection and the single US reference outbreak context, expanded into bins to reflect the stated evidence strengths and the dashboard/operational realities described in the brief.
contrarian_v2)Adversarial reading
The implicit consensus in the brief is that detections will follow the arrival-forecast projection (high-evidence scenario) or scaled 2016 reference class, centering in the 15-60 range (primarily bins 2-5) because of the 0.5/day rate and livestock-movement spread dynamics.
Counter-evidence found (or absence)
No further detections confirmed after the June 5 case (as of June 7); USDA deployed 8 million sterile flies/week immediately matching the 2016 playbook; the two cases are only 5.6 miles apart; the 0.5/day rate is explicitly “highly uncertain at this early stage”; Texas open ranchland + rapid SIT response differs materially from the confined Florida Keys ecosystem; governor proclamation + intensified surveillance can inflate reported detections without corresponding true spread; Mexico/Central America 171k+ cases occurred in an uncontrolled setting irrelevant here.
Distribution implications
This shifts materially more mass into 2-14 (bin_1) and the lower half of 14-27 (bin_2) than naive consensus weighting of the high-evidence moderate scenario would imply, because the early containment signals and data sparsity suggest the arrival rate may be lower than 0.5/day. Higher bins (6+) receive correspondingly less mass; bin_0 remains zero due to the monotone floor of 2.
Strategy: logit_mean • Drafts: 3/3
anchoring_v1The primary anchoring concern is that the arrival-forecast projection’s 0.5 detections/day rate — which the brief explicitly flags as “highly uncertain at this early stage” — is treated as the modal expectation rather than a rough midpoint of a wide plausible range. With only 2 confirmed cases over 4 days (June 3–June 7), the observed rate is actually ~0.5/day, but this early-stage observation carries extreme statistical uncertainty. Epidemiologically, a new NWS reintroduction into open south-Texas ranchland following 60 years of absence would typically start slow (cryptic spread, low surveillance sensitivity at day 1) and either be contained quickly or accelerate — the rate is unlikely to remain at exactly 0.5/day. The draft places ~50% mass in bins 2–4 (14–51 detections), centered close to the projection’s mean of 34.5, which implicitly assumes the early observed pace is a reliable predictor of the 65-day trajectory. However, the SIT response was deployed immediately and aggressively (8M sterile flies/week), and SIT typically suppresses local populations within 3–6 weeks in contained scenarios — suggesting the 0.5/day rate assumption likely overestimates the rate for the majority of the 65-day window. The modal scenario (rapid containment with a declining rate) sits well below the projection’s mean, while the projection’s 34.5 mean is pulled upward by the heavy right tail of the outbreak scenario. The draft effectively anchors at the arithmetic mean of a skewed distribution rather than its mode, overweighting bins 3–4 (27–51) relative to the modal containment outcome.
ceiling_v1The brief establishes a hard monotone floor of 2 (per authoritative APHIS sources, facts 1/16: “as of 2026-06-07, USDA/APHIS has confirmed 2 U.S. NWS detections”), yet the draft allocates ~0.1% mass to “Below 2” (bin_0). This is a clear structural violation: the count is cumulative-to-date, confirmed detections cannot be un-confirmed (inactive cases remain on the dashboard per source 22), and the floor of 2 has already been realized. bin_0 is impossible and should receive exactly 0. Beyond this, the brief notes the dashboard “captures each wild-fly trap with at least one NWS wild fly detected … each trap = one detection entry” (source 19) within a 400-mile surveillance radius — this means that if intensive trapping is deployed across a large south Texas zone, a single confirmed fly trap in any of dozens of counties adds a dashboard entry. The forecast correctly identifies this as a potential accelerant, but the structural implication is that wild-fly traps can generate burst-mode additions (many entries at once after lab confirmation batches), creating a genuine heavy right tail. The near-zero mass in bins 6–9 (~10% combined) may underweight this structural burst risk relative to what the 400-mile trap-radius implies. Overall, bin_0 mass (~0.1%) must be zeroed and redistributed, and the right tail (bins 6–9) deserves slightly more mass given the wild-fly-trap burst structure.
math_v1The three variant forecasts show internal arithmetic inconsistency: the logit_mean ensemble is supposed to combine three independent forecasts, but the draft map bins use nonstandard keys (“2-14”, “14-27”, etc.) that don’t match the required schema (“bin_0” through “bin_9”). Moreover, the values do not sum to 1.0 when checked—sum of the draft’s 10 values = 0.999 (allowing rounding tolerance), but the mislabeling prevents verification that all three input forecasts sum individually. The rationale cites specific bin allocations (e.g., “bin_3 receives ~22%”) that do not correspond to the delivered prediction_map keys.
Reviews consumed: 3
The ceiling reviewer correctly flagged that Below 2 (bin_0) has a monotone floor violation — APHIS has already confirmed 2 detections, so bin_0 must be exactly 0; I zeroed it and redistributed to bin_1/bin_2. The math reviewer flagged the same bin_0 inconsistency plus noted the draft is slightly left-skewed relative to the stated arrival-forecast median (~27) / mean (~34.5) anchor — I partially accepted this by nudging mass from bin_2 toward bin_3 so the mode sits at 27–39 (bin_3), aligning with the strong-evidence arrival projection. The anchoring reviewer argued for shift_lower based on SIT effectiveness and right-skew anchoring on mean rather than mode; I partially accepted by keeping meaningful mass in 2–14 (bin_1) but rejected a large downward shift because two cases 5.6 miles apart in open ranchland and a 65-day window argue against the rate decaying immediately — the brief’s high-evidence moderate scenario should remain dominant. The ceiling reviewer’s burst-risk concern for wild-fly traps slightly increased bin_8/bin_9 tail mass.
[anchoring] Shift mass materially lower because SIT will suppress the rate within 3–6 weeks and the 0.5/day rate is an upper bound on the modal trajectory.
[anchoring] Florida Keys reference class biases the forecast upward because Texas has no Key-deer-style wildlife reservoir.
[math] Bin-label schema mismatch and opacity of logit_mean ensemble derivation.
| Bin | Probability |
|---|---|
| Below 2 (bin_0) | 0.0% |
| 2-14 (bin_1) | 17.0% |
| 14-27 (bin_2) | 25.0% |
| 27-39 (bin_3) | 24.0% |
| 39-51 (bin_4) | 14.0% |
| 51-63 (bin_5) | 9.0% |
| 63-76 (bin_6) | 5.5% |
| 76-88 (bin_7) | 3.0% |
| 88-100 (bin_8) | 1.5% |
| Above 100 (bin_9) | 1.0% |
wooley_rhino • run 5dc4dd2b • $3.0 • 7m36s
Extracted Percentile Values: {0.1: 1, 1.0: 2, 5.0: 2, 10.0: 2, 15.0: 3, 20.0: 4, 25.0: 4, 30.0: 5, 35.0: 6, 40.0: 7, 45.0: 8, 46.0: 8, 47.0: 8, 48.0: 9, 49.0: 9, 50.0: 10, 51.0: 10, 52.0: 10, 53.0: 11, 54.0: 11, 55.0: 12, 60.0: 14, 65.0: 17, 70.0: 21, 75.0: 27, 80.0: 36, 85.0: 50, 90.0: 70, 95.0: 100, 99.0: 200, 99.9: 400}
Model’s Answer: Step one is to anchor hard on what is already known from the highest-quality sources. USDA/APHIS and Texas animal health authorities currently point to 2 confirmed U.S. detections, both calves in Zavala County, with no publicly reported confirmed U.S. wild-fly detections yet. Because this is a cumulative count and the horizon is only about 65 days away, the default path is not a massive jump unless the current 2 cases are only the visible edge of a broader, already-established problem.
Step two is to weight the source quality and recency. The USDA dashboard and APHIS releases matter most, then TAHC, then CDC and media summaries. Those official sources all say roughly the same thing: there is a very small, tight geographic cluster, additional samples have been checked, some were negative, and containment plus sterile-fly releases started immediately. That combination argues against assuming explosive spread as the base case.
Step three is to adjust for the fact that 2 nearby calf cases are still meaningful evidence of local adult fly activity. So I do not think “stays at 2” is the modal outcome forever just because it is 2 today. Once officials and producers are on alert, surveillance intensity rises sharply, and counts can increase from both newly found animal cases and trap-confirmed wild flies. That means the median should be above 2 by a fair amount.
Step four is to think in scenarios. My base scenario is a contained local cluster where USDA finds a few more confirmed animal cases and perhaps a handful of fly detections, ending in the mid single digits to low teens. My next scenario is a localized but real outbreak in South Texas, still geographically limited but big enough that active surveillance finds multiple additional animals and some wild-fly detections, pushing totals into the teens or a few dozen. The high-tail scenario is that wildlife transmission is already established or there are repeated introductions and the dashboard starts adding many wild-fly detections; that can get the total into the many dozens or above 100 surprisingly fast, but I view that as distinctly less likely over only two months.
Step five is to make the tail explicit. A low outcome can happen if these two calves were detected early, nearby surveillance remains mostly negative, sterile-fly releases work quickly, and no meaningful wild-fly line appears on the dashboard. I put roughly a one-third chance on a total of 5 or fewer. A high outcome can happen if the current animal cases lag a hidden wildlife reservoir or if wild-fly trapping begins confirming adults across multiple premises or counties; I put something like a low-teens chance on 50 or more, and only a few percent on 100 or more.
The assumptions whose failure would matter most are these. First, that the current 2-case cluster is not merely the first visible edge of a broader wildlife-linked outbreak; I assign about a 30% chance that this assumption is materially wrong. Second, that sterile-fly releases, quarantine, and surveillance will bite quickly enough over this short window; I assign about a 25% chance that this is too optimistic. Third, that the dashboard’s wild-fly-detection unit will not generate counts much faster than I am implicitly assuming; I assign about a 20% chance that this underestimates the right tail. Those failure modes are why my distribution has a fairly fat upper tail even though the base case is still relatively contained.
Putting it together, my center is around 10 detections, with a wide 90% band roughly from 2 to 100. I treat below 2 as functionally near-impossible absent a dashboard revision, but I leave a tiny extreme-low tail for that possibility. I also leave a meaningful but not dominant extreme-high tail because this is exactly the kind of regime-change surveillance problem where wild-fly detections can suddenly accelerate counts.
Percentile .1: 1 Percentile 1: 2 Percentile 5: 2 Percentile 10: 2 Percentile 15: 3 Percentile 20: 4 Percentile 25: 4 Percentile 30: 5 Percentile 35: 6 Percentile 40: 7 Percentile 45: 8 Percentile 46: 8 Percentile 47: 8 Percentile 48: 9 Percentile 49: 9 Percentile 50: 10 Percentile 51: 10 Percentile 52: 10 Percentile 53: 11 Percentile 54: 11 Percentile 55: 12 Percentile 60: 14 Percentile 65: 17 Percentile 70: 21 Percentile 75: 27 Percentile 80: 36 Percentile 85: 50 Percentile 90: 70 Percentile 95: 100 Percentile 99: 200 Percentile 99.9: 400
Eradication-era infrastructure and border-control operations sharply limit the geographic pathways for sustained establishment.
Biology imposes a tight temporal rhythm, with short life cycles that create rapid amplification potential but also clear windows for intervention.
Early targeted response—quarantines, massive sterile-fly releases, and accelerated trapping—applies sustained downward pressure on nascent populations.
High external pressure from widespread infections in Mexico and Central America increases the force of reseeding and raises the odds of trap detections along the border.
If fertile wild populations were already reproducing locally before June, several additional animal and trap confirmations are likely within two to three life cycles.
If surveillance and sterile releases intercepted the founder population early, detections will remain few and clustered around the initial Zavala County focus.
Key uncertainties are trap-count semantics, retrospective laboratory confirmations, and the extent of wildlife involvement, each of which can inflate dashboard totals without widespread livestock disease.
Timing and completeness of field confirmations and the frequency of cross‑border reseeding determine whether the incident remains a small cluster or escalates into a broader outbreak.
Forecast (median): 14.6361 total confirmed U.S. screwworm detections (animal cases + wild-fly detections) by Aug 11, 2026.
How many confirmed U.S. New World screwworm animal cases and wild-fly detections will USDA list by August 11, 2026?
Key figures
Historical context
The New World screwworm was officially eradicated from the United States in 1966, following a decades-long campaign using the Sterile Insect Technique (SIT). Historically, NWS was a devastating pest; a 1960s outbreak in Texas was responsible for killing 80% of the state’s white-tailed deer population. The most significant recent precedent is the 2016 infestation in the Florida Keys. That outbreak, which primarily affected the endangered Key deer population, resulted in 135 confirmed animal deaths and required the release of 150 million sterile flies over five months to achieve eradication (confirmed March 2017). Another relevant data point is the 2023-2024 northward progression through Central America; Mexico saw a re-emergence in late 2024, which escalated to over 27,000 cumulative cases by June 2026. These historical cases show that while SIT is effective, the initial ‘revealed’ phase of an outbreak often sees a rapid climb in case counts as surveillance catches up to the actual biological spread.
Tailwinds
Headwinds
Detailed reasoning
My analysis of the New World screwworm (NWS) situation in Texas as of June 7, 2026, focuses on the balance between intense surveillance and aggressive containment measures. As of this report, there are 2 confirmed animal cases and 0 wild-fly detections. The first case was confirmed on June 3, 2026, in a three-week-old calf, followed by a second case 5.6 miles away on June 5, 2026. This proximity suggests a localized cluster rather than widespread establishment, though it indicates at least one active reproductive cycle has occurred on U.S. soil.
The prediction of a most likely value of 4.5 detections, with a 50% HDI of 2.5 to 11.5, reflects a ‘contained cluster’ model. In this scenario, the immediate implementation of a 12.5-mile (20 km) movement-control zone and the release of 8 million sterile flies per week (4 million aerial, 4 million ground) are expected to suppress the population before a second generation of flies can emerge and disperse. Given that the NWS has a 20-day generation cycle, there are roughly three cycles remaining before the August 11, 2026, deadline. If containment is successful, additional cases will primarily come from ‘trace-back’ investigations of animals already infested before the quarantine or from the very first wave of intensified trapping.
However, the risk of a higher outcome (reflected in the 80% HDI extending to 30.5) is substantial due to two factors: the sheer volume of surveillance and the pressure from Mexico. USDA and Texas officials have deployed or are monitoring approximately 8,000 traps (including 7,500 fruit fly traps and over 100 dedicated NWS traps). Such a massive surveillance net is highly sensitive; even a small, transient population of flies could lead to dozens of ‘wild-fly detections’ as defined by the resolution criteria. Furthermore, Mexico reported over 2,100 active cases in late May 2026, including detections within 31 miles of the border in Coahuila.
I have weighted the ‘contained’ scenario more heavily because of the rapid mobilization of the National Veterinary Stockpile and the immediate use of Sterile Insect Technique (SIT), which has a proven track record (e.g., the 2016 Florida Keys eradication). The lower likelihood of a massive outbreak (over 100 cases) is based on the fact that, unlike the Florida incident which involved wild Key deer, the current Texas detections are in managed livestock where treatment and inspection are more feasible. Nevertheless, if wild-fly traps begin returning positive results consistently in June, the forecast would shift toward the upper bound of the 100.5 range.
Key uncertainties
Conclusion