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EpiStack v1 — FLF competition
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analyses
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covid
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arguments
Folder: v1/analyses/covid/arguments
75 items under this folder.
Jul 23, 2026
A-1 - Rejecting a population-density (non-contagious) null cannot single out the market as the origin
Jul 23, 2026
A-10 - Rootclaim- SARS-CoV-2's chimeric structure is less likely to form in nature than in a GoF lab
Jul 23, 2026
A-11 - Rootclaim- the furin cleavage site looks like an insertion and is unlikely to arise naturally, favoring a lab origin
Jul 23, 2026
A-12 - Rootclaim- a single index case and immediate human-adaptation favor a lab-engineered origin over natural spillover
Jul 23, 2026
A-13 - Rootclaim- lax WIV biosafety (other coronaviruses apparently escaping) raises the lab-linked hypotheses
Jul 23, 2026
A-14 - Rootclaim- post-outbreak WIV database changes and the RaTG13-BtCoV-4991 renaming suggest attempts to minimize WIV involvement
Jul 23, 2026
A-15 - Rootclaim- China's non-transparent response is mild evidence for a lab-linked origin
Jul 23, 2026
A-16 - Rootclaim- the absence of evidence expected under a lab origin counts against the lab-linked hypotheses
Jul 23, 2026
A-17 - A declining market-linkage fraction over time is the expected signature of a point-source market origin
Jul 23, 2026
A-18 - The market-linkage percentages are upward-biased by ascertainment that actively sought market links
Jul 23, 2026
A-19 - Within-farm sequence divergence plus farm-wide infection implies self-sustaining mink-to-mink transmission
Jul 23, 2026
A-2 - The geometric center of early cases is not a justified estimator of the epidemic origin (centrality does not imply causality)
Jul 23, 2026
A-20 - A worker infected during the acute mink outbreak, in a shed with airborne viral RNA, more plausibly acquired the virus from mink than from the community
Jul 23, 2026
A-21 - Stansifer- multiplying many selectively-chosen weak Bayes factors inflates the total arbitrarily (the space-lizard critique of Rootclaim's construction)
Jul 23, 2026
A-22 - Stansifer- zoonotic prior P(Z) about 1 per 32,000 years for an HSM-specific SARS-CoV-2-like pandemic
Jul 23, 2026
A-23 - Stansifer- lab-leak prior P(LL) about 1 per 17,000 years, twice the zoonotic prior because a GoF leak is likelier in Wuhan specifically
Jul 23, 2026
A-24 - Stansifer- the first case cluster centering on HSM is the dominant factor, a Bayes factor of ~1-10000 favoring zoonosis
Jul 23, 2026
A-25 - Stansifer- within-market positive samples concentrating on the wildlife shop 6-29 is ~Bayes 15 for zoonosis, but he excludes it as non-essential
Jul 23, 2026
A-26 - Stansifer- the 12-nucleotide insert creating the furin cleavage site is weak lab-leak evidence, Bayes factor 20
Jul 23, 2026
A-27 - Stansifer- SARS-CoV-2's strong human-ACE2 affinity is minor lab-leak evidence, Bayes factor 2 (capped at 14)
Jul 23, 2026
A-28 - Stansifer- no whistleblower - the lab-leak secret never escaping is weak zoonotic evidence, Bayes factor 1-10
Jul 23, 2026
A-29 - Stansifer- the precise 1-in-1300 is not to be believed, but no reasonable dampening for uncertainty crosses the 50% line (qualitative summary- strong zoonotic)
Jul 23, 2026
A-3 - Single introduction almost never reproduces the two-lineage two-mutation topology, favoring two or more introductions
Jul 23, 2026
A-30 - Stansifer- the DEFUSE 'predicted SARS-CoV-2's features' coincidence is matched by a zoonotic-side coincidence (Holmes's 2014 photos of shop 6-29), so it does not asymmetrically favor lab leak
Jul 23, 2026
A-31 - The animal-negative result is uninformative because sampling began after animals were removed
Jul 23, 2026
A-32 - Spatial clustering of virus in the wildlife wing co-located with wildlife material fits wildlife-market emergence
Jul 23, 2026
A-33 - Environmental swabs cannot distinguish whether humans or animals deposited the virus
Jul 23, 2026
A-34 - Widespread market surface contamination is compatible with human shedding and does not by itself demonstrate an infected-animal source
Jul 23, 2026
A-35 - Correcting Pekar 2022 asymmetric conditionalization reverses its Bayes factor to at least 4.4 favouring a single introduction
Jul 23, 2026
A-36 - Logit-additive combination with dependence handling and uncertainty discounting yields combined odds favouring lab leak
Jul 23, 2026
A-37 - Historical lab-leak base rates plus WIV-specific factors set the 1-in-100 to 1-in-200 prior
Jul 23, 2026
A-38 - The outbreak occurring specifically in Wuhan is a strong likelihood factor for lab origin
Jul 23, 2026
A-39 - The sarbecovirus lineage, furin cleavage site, and DEFUSE-matching features each favour lab origin
Jul 23, 2026
A-4 - Low-coverage lab-clustered intermediates indicate contamination, not real transitional genotypes
Jul 23, 2026
A-40 - Ascertainment bias, not a market spillover, best explains the Huanan-market case clustering
Jul 23, 2026
A-41 - With overdispersed infectiousness, chance superspreader placement, not average R0 or spillover location, governs whether and where a pathogen first cluster appears
Jul 23, 2026
A-42 - The hospital-centred Ebola case series reflects iatrogenic amplification, so the detected cluster locates the amplifying venue not the zoonotic spillover
Jul 23, 2026
A-43 - Both lineages independently centering on the market points to the market as the common emergence locus
Jul 23, 2026
A-44 - Market-unlinked cases clustering on the market argues the signal is not mere market-link ascertainment
Jul 23, 2026
A-45 - Positive samples localizing to a live-mammal stall ties earliest contamination to the wildlife trade
Jul 23, 2026
A-46 - DEFUSE shows the exact manipulation debated in SARS-CoV-2's genome was proposed -2 years before emergence at the implicated institutions
Jul 23, 2026
A-47 - DEFUSE is evidence of intent and capability, not of execution- a rejected proposal, chimera work slated for UNC, using known low-risk SARS-1-related backbones
Jul 23, 2026
A-48 - Concentration of viral positivity at the exact stall selling susceptible mammals raises the probability of an infected-animal source but does not prove infection
Jul 23, 2026
A-49 - The reported negative correlation between wildlife mtDNA and viral RNA is largely a sampling-design artifact, not evidence against a wildlife source
Jul 23, 2026
A-5 - Both lineages spread without within-human adaptation, implying a pre-adapted animal reservoir
Jul 23, 2026
A-50 - Recovery of narrow-host-range wildlife virus genomes co-located with their hosts implies live, productively infected animals were present in the market
Jul 23, 2026
A-51 - Market-associated genomes' tMRCA equalling the global tMRCA, with both lineages present, indicates emergence at the market rather than downstream amplification
Jul 23, 2026
A-52 - A species absent from the traded stock cannot be the market spillover vector
Jul 23, 2026
A-53 - Susceptible mammals sold live under high-contact conditions supply the animal-side precondition for market spillover
Jul 23, 2026
A-54 - SARS-CoV-2 tracking fish and livestock rather than raccoon dogs is the pattern expected from human deposition, undercutting the specific raccoon-dog-shedding claim
Jul 23, 2026
A-55 - Because the samples were collected a month into widespread human transmission, their viral-animal co-location is uninformative about the outbreak source in either direction
Jul 23, 2026
A-56 - Market-positive-farm-negative split with a within-owner control locates infection at the market
Jul 23, 2026
A-57 - Prototype-to-epidemic SNV progression indicates active viral adaptation in civets at the market
Jul 23, 2026
A-58 - Suboptimal, non-designed-looking RBD argues against rational engineering
Jul 23, 2026
A-59 - Pangolin coronaviruses proving the optimized RBD exists in nature argues against engineering
Jul 23, 2026
A-6 - Rootclaim base-rate prior- accidental lab escape is a priori very unlikely (~0.6%) versus 78% zoonotic
Jul 23, 2026
A-60 - Backbone matching no known reverse-genetics system argues against lab construction
Jul 23, 2026
A-61 - Natural routes for the furin site plus O-linked glycans argue against a cell-culture origin
Jul 23, 2026
A-62 - Anomalously short longest fragment places SARS-CoV-2's map in the engineered tail of the wild-type distribution
Jul 23, 2026
A-63 - Exclusively silent mutations concentrated at the restriction sites match the engineering signature
Jul 23, 2026
A-64 - BsaI sites flanking S1-RBD match a purposeful design for RBD-FCS manipulation
Jul 23, 2026
A-65 - A wild bat RBD binding hACE2 as well as SARS-CoV-2 shows no lab adaptation is needed for human-ACE2 use
Jul 23, 2026
A-66 - Mosaic recombination placing SARS-CoV-2's RBD in the wild bat clade supports a natural recombinant origin
Jul 23, 2026
A-67 - The furin cleavage site is the one feature not bridged by the closest wild relatives
Jul 23, 2026
A-68 - A single natural recombination producing the backbone+RBD+FCS combination is a priori improbable
Jul 23, 2026
A-69 - The out-of-frame furin-site insertion rules out slippage-type natural insertion mechanisms
Jul 23, 2026
A-7 - Rootclaim- COVID-19's moderate contagion-lethality makes it a poor traditional bioweapon (bioweapon divided by 10)
Jul 23, 2026
A-70 - Rare CGG-CGG codon usage plus a conveniently placed FauI site is more expected from lab insertion
Jul 23, 2026
A-71 - Chimeric-CoV construction and furin-site insertion were routine, trace-free 2015-2018 techniques
Jul 23, 2026
A-72 - Rebuttal- the RBD's human-ACE2 optimization does not preclude rational design
Jul 23, 2026
A-73 - The two lab-leaning agencies (FBI, DOE) are the ones with the most relevant scientific capability, giving their lean more weight than a bare 2-of-8 headcount, but low-moderate confidence and classified reasoning cap the update
Jul 23, 2026
A-74 - The FBI and DOE lab positions share a classified evidence pool and are politically salient, so they are not two independent lines of evidence; DOE's reportedly distinct reasoning only partly mitigates this
Jul 23, 2026
A-75 - The split, low-confidence IC verdict (2 lab, 4 natural, rest unresolved) shows the IC has not resolved origin, and DOE's lean rests partly on absence-of-evidence, making the institutional record a weak signal either way
Jul 23, 2026
A-8 - Rootclaim- outbreak first appearing in Wuhan (home of the WIV) strongly favors a lab origin
Jul 23, 2026
A-9 - Rootclaim- the Wuhan wet-market case cluster favors zoonosis (net factor toward natural spillover)
Graph View
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interactive Bayesian view — separate from the graph above
added after the FLF submission deadline