Scan: Pandemic in 2026? — Forecasting Agent

1. Planner Fable 5.1 · Fermi decomposition + tool plan

Tools chosen: kalshi_direct kalshi_related polymarket_related resolution_source article_search claude_news gdelt_news wikipedia code_execution

Sub-questions (Fermi decomposition)

What is the current Kalshi YES price and how has it trended, and what does the Kalshi rulebook count as a 'pandemic' (WHO declaration of a pandemic/pandemic emergency vs. PHEIC vs. other authority)?
What is the historical base rate of WHO-declared pandemics per year (only 2009 H1N1 and 2020 COVID-19 in ~25 years), and how does the 2025 WHO Pandemic Agreement's new 'pandemic emergency' designation change the likelihood of a formal declaration?
Is there currently evidence of sustained human-to-human transmission of H5N1 or any other novel influenza strain, and what do CDC/WHO risk assessments say as of early 2026?
Are any active outbreaks (mpox clade Ib, Marburg, Nipah, novel coronavirus, chikungunya, measles) currently under PHEIC status or being described by WHO as approaching pandemic potential?
Has WHO or any major health authority already used the word 'pandemic' for any 2026 disease event, or is there an ongoing multi-region outbreak that could plausibly be labeled a pandemic before end of 2026?
What do related Kalshi and Polymarket markets (H5N1, WHO PHEIC, bird flu, new pandemic) price for similar outcomes, and do the venues disagree?

Planner reasoning

This is a low-base-rate tail event question: WHO has declared a 'pandemic' only twice in the past 20 years (H1N1 2009, COVID-19 2020), and the exact resolution criterion (WHO declaration vs. PHEIC vs. media usage) matters enormously since rules are unspecified. Key drivers are current outbreak threats (H5N1 avian flu human-to-human transmission, mpox clade Ib, novel coronaviruses, measles resurgence) and WHO's post-2024 Pandemic Agreement framework for declaring a 'pandemic emergency'. Market price is the primary anchor; cross-venue Polymarket pricing on similar questions and news on current epidemiological threats will refine it.

2. Research Parallel tool calls

tool	status	time	items	summary
kalshi_direct	OK	0.2s	1	## This Market's Kalshi Data In 2026 (KXNEWOUTBREAK-P-26) - Current price (probability): 8.00% - 7-day price change: +4.00% - 30-day price change: +3.00% - Average daily volume: 1630 contracts - Price range: 4.00% - 8.00% - Data points: 87 days
kalshi_related	OK	2.7s	0	0 related markets / summaries. series KXNEWOUTBREAK: 0 markets (skipped 0 no-signal) \| series KXPHEIC: 0 markets (skipped 0 no-signal) \| series KXBIRDFLU: 0 markets (skipped 0 no-signal) \| series KXH5N1: 0 markets (skipped 0 no-signal) \| keyword 'pandemic': no matches \| keyword 'bird flu': no matche
polymarket_related	OK	0.8s	4	Polymarket search over 5 keyword(s), kept 4 matches. keyword 'pandemic': 4 markets \| keyword 'H5N1': 0 markets \| keyword 'bird flu': 0 markets \| keyword 'WHO emergency': 0 markets \| keyword 'PHEIC': 0 markets
resolution_source	OK	6.4s	1	already_resolved=no; matches_criteria=False; last_updated=2026-03-06 (CDC page); WHO page shows copyright 2026 but no dated content for 2026 entries. WHO Disease Outbreak News page shows no results for 2026 filter criteria, and WHO's ongoing emergencies list (Ebola, Cholera, Mpox, COVID-19) does not
article_search	OK	1.2s	37	Fetched 37 unique articles across 5 queries (lookback=45d). 'WHO pandemic declaration 2026': 10 articles \| 'H5N1 human to human transmission': 10 articles \| 'WHO public health emergency of international concern 2026': 10 articles \| 'mpox clade Ib spread 2026': 10 articles \| 'novel virus outbreak pan
claude_news	OK	23.0s	12	## Summary of Findings: Pandemic Risk Assessment 2026 - Ebola (Bundibugyo virus) PHEIC declared May 2026: On 17 May 2026, WHO's Director-General determined that Ebola disease caused by Bundibugyo virus in DRC and Uganda constitutes a public health emergency of international concern (PHEIC) .
gdelt_news	OK	200.1s	30	GDELT: 30 articles across 4 queries (lookback=30d). 'pandemic declared WHO': 10 hits \| 'H5N1 human cases cluster': error GDELT rate-limited after retries (429) \| 'PHEIC declaration': 10 hits \| 'outbreak pandemic potential': 10 hits
wikipedia	OK	0.7s	5	Fetched 5 Wikipedia entries (0 missing pages).
code_execution	OK	14.4s	0	## Base Rate Analysis: WHO-Declared Pandemic in 2026 Strict WHO-pandemic criterion (H3N2 1968, H1N1 2009, COVID-19 2020): - Since 1968 (3 events / 58 years): rate = 0.0517/yr → P(≥1 in 2026) ≈ 5.04% - Since 2000 (2 events / 26 years): rate = 0.0769/yr → P(≥1 in 2026) ≈ 7.40% - Average o

3. Evidence Brief Sonnet 5 · 6949 chars

# Current state As of the research date (~2026-09), no disease has been declared a "pandemic" by WHO in 2026. An Ebola (Bundibugyo virus) outbreak in DRC/Uganda was declared a PHEIC on 2026-05-17, with WHO explicitly stating it does NOT meet pandemic-emergency criteria. Kalshi YES price sits at 8%, up from 4% a month ago, reflecting elevated but still low probability given the active Ebola PHEIC and ongoing mpox/H5N1 watch. # Timeline of key events - 2025-05: WHO Pandemic Agreement adopted, creating a new "pandemic emergency" tier above PHEIC (confirmed, Wikipedia). - 2025-09: IHR amendments (incl. pandemic emergency framework) enter into force (confirmed, claude_news). - 2025-09-05: Mpox clade Ib PHEIC lifted by WHO (confirmed). - 2026-01: Mpox PHEIC (second declaration) also lifted (reported, per Lancet/PMC synthesis — dates slightly inconsistent across sources). - 2026-01: India notifies WHO of a recombinant mpox case (clades Ib+IIb) with onward-transmission potential (confirmed, WHO DON-595). - 2026-05-15/17: WHO declares Ebola (Bundibugyo virus) outbreak in DRC/Uganda a PHEIC; Africa CDC declares continental public health emergency 2026-05-18 (confirmed, multiple sources). - 2026-05-29: Ebola outbreak at 1,262 suspected/confirmed cases, 241 deaths (confirmed, Wikipedia). - 2026-08-22: H1N1 swine flu surge reported in Delhi (1,777 cases, zero deaths) — described as differing from COVID (reported). - 2026-08-29: Second IHR Emergency Committee meeting on the Ebola Bundibugyo epidemic (confirmed, WHO/webwire). - 2026-09 (ongoing): Bangladesh measles outbreak causing high mortality (reported); no pandemic label applied. - Throughout 2026: CDC maintains H5N1 general public risk as "low"; no sustained human-to-human transmission confirmed (confirmed, CDC/AAO sources). # Event Will any disease be declared/become a pandemic in 2026 (Kalshi KXNEWOUTBREAK-P-26)? # Outcomes to forecast Yes / No # Kalshi market anchor **Current YES price: 8.00%** (up from 4% 30 days ago, +4pts in 7 days — recent upward drift, likely tied to Ebola PHEIC/mpox recombinant news). Avg daily volume ~1,630 contracts; price range over 87 days: 4–8%. This is the consensus to beat. # Resolution source WHO Disease Outbreak News and WHO emergencies/situations pages (checked 2026-03-06 equivalent, ongoing) show no 2026 disease labeled "pandemic"; ongoing emergencies list (Ebola, Cholera, Mpox, COVID-19 legacy) uses PHEIC/epidemic terminology only. CDC bird-flu page states public risk "low." Resolution condition (pandemic declaration) is NOT currently met. # Sub-question answers 1. **Kalshi price/rulebook** — YES=8%, uptrend (+4% wk, +3% mo). No explicit rulebook text found; description implies any WHO-recognized "pandemic" designation triggers Yes. [kalshi_direct] 2. **Historical base rate** — Only 3 WHO pandemic-tier events since 1968 (H3N2, H1N1 2009, COVID-19 2020); strict base rate ≈5–7%/yr. New "pandemic emergency" tier (2025 Pandemic Agreement) hasn't been invoked yet in 2026, and no case has met that threshold. [code_execution, Wikipedia] 3. **H5N1 human transmission** — No sustained human-to-human transmission confirmed; CDC assessment remains "low" risk for general public as of mid-2026, cases still linked to dairy/poultry exposure. [claude_news, CDC] 4. **PHEIC/pandemic-potential outbreaks** — Ebola Bundibugyo PHEIC active since 2026-05-17 (DRC/Uganda); WHO explicitly says it does not meet pandemic criteria. Mpox PHEICs both lifted; recombinant clade Ib/IIb strain flagged but risk to general population "low." [claude_news, Wikipedia] 5. **Has "pandemic" been used for any 2026 event?** — No. WHO/CDC use PHEIC/epidemic terminology only; no formal pandemic declaration found. [resolution_source, claude_news] 6. **Related markets** — Kalshi has no other related series with signal (KXPHEIC, KXBIRDFLU, KXH5N1 all empty). Polymarket prices "New pandemic in 2026" at 5.5%, "New Coronavirus Pandemic" 5%, "Hantavirus pandemic" 2.8%, "Ebola pandemic" 2.45% — all lower than Kalshi's 8%. [polymarket_related] # Key facts (high-confidence, factual) 1. [Kalshi] YES=8%, trending up from 4% (30d). 2. [WHO/claude_news] Ebola Bundibugyo PHEIC declared 2026-05-17; explicitly NOT pandemic-tier. 3. [CDC] H5N1 general public risk "low," no sustained human transmission (as of 2026). 4. [Wikipedia/claude_news] New "pandemic emergency" tier created by 2025 WHO Pandemic Agreement/IHR amendments (in force Sept 2025) — untested as of 2026, raising possibility of easier future declarations but not yet used. 5. [Polymarket] Sum of disease-specific "pandemic in 2026" Yes prices (hantavirus, Ebola, coronavirus, generic) all ≤5.5%, below Kalshi's 8%. # Cross-market signals - Kalshi related: no other signal-bearing series (PHEIC/bird flu/H5N1 series empty). - Polymarket: "New pandemic in 2026" =5.5%, "New Coronavirus Pandemic"=5%, "Ebola pandemic"=2.45%, "Hantavirus pandemic"=2.8% — all notably below Kalshi's 8%, suggesting Kalshi may be pricing in generic/other-disease pandemic risk more broadly, or is slightly overpriced relative to Polymarket disaggregated views. - Sportsbook implied: none available. # Analyst opinions and speculation - ZeroHedge/Epoch Times (skeptical framing): "WHO Says Pandemic Determinations Can Be Made Without Evidence Of Illness" — suggests political/definitional controversy around new pandemic-emergency tier that could lower the bar for future declarations (unconfirmed/opinion-driven, 2026-08-23). - Public health commentary (Canada's chief science adviser, Aug 2026) flags concern about "world falling behind on Ebola response," implying escalation risk remains open (reported). # Directional lean per outcome - **Yes**: Ebola PHEIC could theoretically escalate; new "pandemic emergency" tier lowers definitional bar; H5N1 persistent background risk; ~4 months remain in 2026. - **No** (favored): WHO explicitly declined pandemic classification for Ebola; H5N1/mpox risk assessments remain low; no sustained human-to-human transmission of any high-risk pathogen; historical base rate strict ~5-7%/yr; Polymarket disaggregated markets price lower than Kalshi. # Gaps / unknowns - Exact Kalshi resolution criteria/rulebook text not available — unclear if PHEIC or "pandemic emergency" tier alone could trigger Yes, or only an explicit WHO "pandemic" declaration. - No visibility into Sept–Dec 2026 developments (data cutoff ~Sept 2026), leaving ~3 months of tail risk unassessed. - Definitional ambiguity from new IHR pandemic-emergency mechanism untested in practice. # Calibration anchors - Kalshi current YES price: 8% (anchor, trending up). - Polymarket comparable markets: 2.5–5.5% range. - Base rate (strict WHO pandemic definition): 5–7%/yr; blended with PHEIC-loose definition: 14–15%/yr (code_execution). - Precedent: 2009 H1N1, 2020 COVID-19 only strict pandemic declarations in 25+ years; multiple PHEICs (Ebola x2, Zika, mpox x2, polio) did NOT become pandemics.

4. Forecasters 5 draws · Fable 5.1 + GPT-5.6 Sol

claude-fable-5-1

62% conf

Yes	6%
No	94%

The resolution source (WHO DON/emergencies pages) shows no 2026 disease labeled 'pandemic'; the active Ebola Bundibugyo PHEIC was explicitly judged by WHO as not meeting pandemic criteria, and H5N1/mpox risk assessments remain 'low' with no sustained human-to-human transmission. The strict WHO base rate is ~5-7% per full year, and with only ~4 months remaining the conditional probability is lower, though the untested 'pandemic emergency' tier and an escalating Ebola outbreak add some definitional and tail risk. Kalshi's 8% (anchor, drifting up) sits above Polymarket's 5.5% generic pandemic market and disaggregated disease-specific prices (2.5-5%), suggesting Kalshi is modestly overpriced. I land slightly below the Kalshi anchor at 6% Yes.

claude-fable-5-1

62% conf

Yes	6%
No	94%

As of ~Sept 2026 no disease has been declared a pandemic; WHO explicitly stated the Ebola Bundibugyo PHEIC does not meet pandemic-emergency criteria, and H5N1/mpox risk assessments remain 'low' with no sustained human-to-human transmission. The strict historical base rate is ~5-7%/yr, and with only ~3-4 months left in 2026 the prorated risk is lower still, while Polymarket comparable markets price 2.5-5.5%. Kalshi's 8% anchor likely reflects rulebook ambiguity (whether a 'pandemic emergency' tier or loose media usage could trigger Yes) plus the recent Ebola/mpox headlines, so I shade slightly below the Kalshi price toward the Polymarket consensus but keep meaningful tail probability for an unassessed Sept-Dec escalation or a loose resolution interpretation.

claude-fable-5-1

58% conf

Yes	6%
No	94%

As of ~Sept 2026, no disease has been labeled a pandemic; WHO explicitly stated the Ebola Bundibugyo PHEIC does not meet pandemic-emergency criteria, and H5N1/mpox risk assessments remain 'low' with no sustained human-to-human transmission. The strict historical base rate is ~5–7% per full year, and only ~3–4 months remain, which alone implies ~2–3% residual risk; the active Ebola PHEIC, the untested (and possibly lower-bar) 'pandemic emergency' tier, and rulebook ambiguity justify some premium above that. Kalshi's 8% anchor sits above Polymarket's 5.5% for the generic 2026 pandemic market, and the recent uptick appears news-driven rather than reflecting a concrete escalation path, so I shade slightly below Kalshi toward the cross-market consensus.

gpt-5.6-sol

72% conf

Yes	6%
No	94%

Kalshi's 8% YES price is the primary anchor, but comparable Polymarket pricing of 2.5–5.5% supports a modest downward adjustment. The active Ebola PHEIC points to some tail risk, yet WHO explicitly says it does not meet pandemic criteria, while mpox emergencies have ended and H5N1 still lacks sustained human-to-human transmission. No disease had received a pandemic designation by September, leaving only roughly three months for a new outbreak to emerge and cross WHO's historically rare threshold. Uncertainty over whether Kalshi treats the new 'pandemic emergency' tier as sufficient prevents a larger move below the market price.

gpt-5.6-sol

74% conf

Yes	6%
No	94%

Kalshi’s 8% YES price is the primary anchor, but comparable Polymarket pricing near 5.5% and the shortened remaining 2026 window support a modest downward adjustment. WHO has explicitly said the active Ebola PHEIC does not meet pandemic-emergency criteria, while mpox emergencies have ended and H5N1 still lacks sustained human-to-human transmission. The low historical frequency of WHO pandemic-tier events further favors No. Residual YES risk comes from Ebola escalation, an unforeseen outbreak, and ambiguity over whether the new pandemic-emergency designation would satisfy Kalshi’s unavailable rulebook.

6. Final plain mean of 5 draws

6% (66% confidence)

Yes: 6% No: 94%

Mean of 5 draws (0.06, 0.06, 0.06, 0.07, 0.06). The resolution source (WHO DON/emergencies pages) shows no 2026 disease labeled 'pandemic'; the active Ebola Bundibugyo PHEIC was explicitly judged by WHO as not meeting pandemic criteria, and H5N1/mpox risk assessments remain 'low' with no sustained human-to-human transmission. The strict WHO base rate is ~5-7% per full year, and with only ~4 months remaining the conditional probability is lower, though the untested 'pandemic emergency' tier and an escalating Ebola outbreak add some definitional and tail risk. Kalshi's 8% (anchor, drifting up) sits above Polymarket's 5.5% generic pandemic market and disaggregated disease-specific prices (2.5-5%), suggesting Kalshi is modestly overpriced. I land slightly below the Kalshi anchor at 6% Yes.

Pipeline Timing

Total pipeline time: 266.7s

Per-tool research timings shown in the Research section above.