Claims
Search the graph by meaning. Each result carries its current verdict; open one to see its decomposition, provenance, and the reasoning behind the assessment.
KindShowingImportancePrizesTopicSARS-CoV-2 origin
Claims about the natural or laboratory origin of SARS-CoV-2, the virus that causes COVID-19.
The correct rooting of the early SARS-CoV-2 phylogenetic tree is uncertain
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 phylogeneticsSARS-CoV-2 lineages A and Bimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Reported intermediate A-B SARS-CoV-2 genomes are genuine biological intermediates, not sequencing artifacts
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BSARS-CoV-2 phylogeneticsCoronavirus recombinationimportance · notableImportance 0.45, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Excluding intermediate lineage A/B SARS-CoV-2 genomes materially affects Pekar et al.'s inferred number of spillovers
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BSARS-CoV-2 phylogeneticsimportance · notableImportance 0.45, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Pekar et al.'s two-spillover phylodynamic inference is robust to model assumptions
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BSARS-CoV-2 phylogeneticsStatistical Uncertainty Analysisimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The furin cleavage site in SARS-CoV-2 is evidence of laboratory engineering
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →evaluativeA judgment of worth or quality against some standard: good, fair, effective.constitution →Furin cleavage siteVirologyimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Intermediate A-B SARS-CoV-2 genomes existed among early human cases
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BSARS-CoV-2 phylogeneticsimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The WIV possessed or had access to a bat coronavirus sufficiently similar to SARS-CoV-2 to serve as an engineering backbone
DoubtfulThe evidence weighs against the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Wuhan Institute of VirologyCoronavirus reverse geneticsimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The WIV possessed or could have engineered a close progenitor of SARS-CoV-2
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · verifiableA factual claim that could be checked directly against observation or primary records.constitution →Wuhan Institute of VirologyCoronavirus reverse geneticsimportance · majorImportance 0.65, from 0 to 1 · major: real consequence within a domain, actively argued. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
COVID-19 cases occurred before the Huanan Market cluster began
DoubtfulThe evidence weighs against the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · verifiableA factual claim that could be checked directly against observation or primary records.constitution →Early COVID-19 cases in WuhanHuanan Seafood Wholesale Marketimportance · majorImportance 0.65, from 0 to 1 · major: real consequence within a domain, actively argued. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
A Huanan Market-linked vendor with symptom onset around December 11, 2019 was the earliest documented COVID-19 case
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Early COVID-19 cases in WuhanHuanan Seafood Wholesale Marketimportance · notableImportance 0.55, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
SARS-CoV-2 has a laboratory origin
DoubtfulThe evidence weighs against the claim, but the examination is incomplete or the evidence is indirect.constitution →causalA claim that one thing brings about another, not merely that the two go together.constitution →Wuhan Institute of Virologyimportance · centralImportance 0.90, from 0 to 1 · central: consequential and genuinely contested: a live crux. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
A peer-reviewed report documented a COVID-19 case with symptom onset on December 1, 2019 and no epidemiological link to the Huanan Seafood Market
VerifiedThe evidence, examined directly, establishes the claim.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Early COVID-19 cases in WuhanHuanan Seafood Wholesale Marketimportance · minorImportance 0.30, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
SARS-CoV-2 originated through zoonotic spillover at the Huanan Seafood Market in Wuhan
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →causalA claim that one thing brings about another, not merely that the two go together.constitution →Huanan Seafood Wholesale MarketZoonotic spilloverimportance · centralImportance 0.88, from 0 to 1 · central: consequential and genuinely contested: a live crux. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Two basal SARS-CoV-2 lineages are statistically improbable under a single spillover event
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BSARS-CoV-2 phylogeneticsZoonotic spilloverimportance · notableImportance 0.55, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
A spatial statistical test does not validly establish non-random clustering of early COVID-19 cases around the Huanan Market
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Spatial clustering statisticsHuanan Seafood Wholesale MarketEarly COVID-19 cases in Wuhanimportance · notableImportance 0.55, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The population-density null hypothesis used in the Huanan market spatial clustering test is statistically inappropriate
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Spatial clustering statisticsHuanan Seafood Wholesale Marketimportance · minorImportance 0.40, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The WIV held undisclosed bat coronaviruses more similar to SARS-CoV-2 than those it published
UnknownInsufficient information to assess.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Wuhan Institute of Virologyimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Worobey et al.'s early-case clustering around the Huanan market persists under a social-media-mobility null instead of a population-density null
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Spatial clustering statisticsHuanan Seafood Wholesale MarketEarly COVID-19 cases in Wuhanimportance · minorImportance 0.40, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Early COVID-19 case ascertainment was biased toward cases linked to the Huanan market
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →EpidemiologyHuanan Seafood Wholesale MarketEarly COVID-19 cases in Wuhanimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Lineage distribution patterns indicate two independent spillover events at the Huanan Market
InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BHuanan Seafood Wholesale MarketZoonotic spilloverimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
No natural progenitor or intermediate animal host of SARS-CoV-2 has been identified
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Zoonotic spilloverimportance · notableImportance 0.50, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Pekar et al.'s corrected analysis retained the two-spillover conclusion after the 2023 erratum
VerifiedThe evidence, examined directly, establishes the claim.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BZoonotic spilloverimportance · minorImportance 0.35, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The furin cleavage site in SARS-CoV-2 uses an arginine codon (CGG) uncommon in sarbecoviruses
VerifiedThe evidence, examined directly, establishes the claim.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Furin cleavage siteSarbecovirus codon usageimportance · minorImportance 0.35, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
In a 2024 survey of 168 experts (mostly epidemiologists and virologists), respondents on average assigned substantially higher probability to a zoonotic origin of SARS-CoV-2 (~77%) than to a lab-leak origin (~21%).
VerifiedThe evidence, examined directly, establishes the claim.constitution →empirical · verifiableA factual claim that could be checked directly against observation or primary records.constitution →Expert opinion surveysVirologyimportance · minorImportance 0.35, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The WIV possessed unpublished bat coronavirus sequences that it did not disclose
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Wuhan Institute of VirologyUndisclosed coronavirus sequence dataimportance · notableImportance 0.50, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The WIV took its bat virus sequence database offline in September 2019 and never republished it
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Undisclosed coronavirus sequence dataWuhan Institute of Virologyimportance · minorImportance 0.40, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Pekar et al.'s two-spillover conclusion depends on the phylogenetic rooting of early SARS-CoV-2 sequences
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 phylogeneticsSARS-CoV-2 lineages A and Bimportance · notableImportance 0.45, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
COVID-19 cases with no direct link to the Huanan market also clustered spatially around the market
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Huanan Seafood Wholesale MarketEarly COVID-19 cases in WuhanSpatial clustering statisticsimportance · notableImportance 0.45, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Lineage A was present at the Huanan Seafood Market
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Huanan Seafood Wholesale MarketSARS-CoV-2 lineages A and Bimportance · minorImportance 0.40, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The WIV had the technical capability to engineer a SARS-CoV-2-like coronavirus
VerifiedThe evidence, examined directly, establishes the claim.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Wuhan Institute of VirologyCoronavirus reverse geneticsimportance · minorImportance 0.40, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Genuine A/B intermediate genomes would be inconsistent with a two-spillover origin of SARS-CoV-2
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BSARS-CoV-2 phylogeneticsimportance · minorImportance 0.30, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The furin cleavage site is absent from the closest known natural relatives of SARS-CoV-2
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Furin cleavage siteimportance · minorImportance 0.30, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Pekar et al. concluded SARS-CoV-2 arose from at least two separate zoonotic spillover events
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Zoonotic spilloverSARS-CoV-2 lineages A and Bimportance · settledImportance 0.15, from 0 to 1 · settled: uncontested, so low even when much depends on it. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
A coronavirus 96% genetically identical to SARS-CoV-2 is too divergent to serve as a practical engineering backbone
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Coronavirus reverse geneticsimportance · minorImportance 0.40, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Pekar et al. excluded intermediate lineage A/B genomes from their spillover analysis
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 lineages A and BSARS-CoV-2 phylogeneticsZoonotic spilloverimportance · settledImportance 0.15, from 0 to 1 · settled: uncontested, so low even when much depends on it. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The WIV possessed RaTG13, a bat coronavirus that was the closest known relative of SARS-CoV-2 at the time of the outbreak
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Wuhan Institute of VirologySARS-CoV-2 phylogeneticsimportance · settledImportance 0.15, from 0 to 1 · settled: uncontested, so low even when much depends on it. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Natural recombination can generate furin cleavage site insertions in coronaviruses
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Furin cleavage siteCoronavirus recombinationimportance · notableImportance 0.50, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The furin cleavage site in SARS-CoV-2 is suboptimal and not an idealized engineered sequence
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Furin cleavage siteVirologyimportance · notableImportance 0.50, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
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