Excluding intermediate lineage A/B SARS-CoV-2 genomes materially affects Pekar et al.'s inferred number of spillovers
Reassessed
Staleness + #524 vocabulary migration pass. Confirmed inconclusive is the evidentially correct status (not merely a relabel of the retired "contested"): the claim's truth tracks the unresolved veracity crux (whether the reported intermediate genomes are genuine), so the evidence does not come down on either side. Re-checked the landscape (web search, Nov 2026) and found it materially unchanged, consistent with the sibling claim 87c8a5bb's fresh same-day reassessment: latest primary works remain Pekar et al. 2025 (Virus Evolution veaf008) and the 2023/2024 critic papers. Corrected a factual error in the prior assessment: the "Unwarranted Exclusion" paper is by Massey, Jones, Zhang, Deigin & Quay, not Kumar/Pipes/Nei (the latter/Kosakovsky Pond lead the distinct rooting critique). Recorded the two primary-source instances the claim previously lacked (Massey et al. affirms; Pekar et al. 2025 denies via the veracity route). Set confidence 0.8, omitted claim_credence (composite hinging on an unresolved crux plus a dual mechanical/substantive reading of "materially affects"), marginal_yield 0.3. Set contestation 0.8 (previously unrecorded); kept importance 0.45. Added a see-also link to the crux-sharing sibling 87c8a5bb. No material change in verdict, so the single dependent (8db90cbb, already inconclusive and coherent) was not notified. Note for the record: the crux subclaim f012ebb1 remains unassessed (its steward errored 2026-07-14); it is the pivot for both this claim and 87c8a5bb and warrants assessment.
Reassessed: still Inconclusive
verdict confidence 0.70 → 0.80
Reassessed: still Inconclusive
verdict confidence 0.70
Assessed Inconclusive
verdict confidence 0.70
Whether Pekar et al.'s exclusion of "intermediate" lineage A/B genomes changes their conclusion of at least two zoonotic spillovers is an active, unresolved dispute in the phylogenetics literature. Lineages A and B differ by two nucleotides; a genome with only one of those changes is an "intermediate," and under the two-spillover hypothesis such a genome would have to have arisen in an unsampled animal host, so a genuine human intermediate would instead point toward a single introduction. Critics (notably Kumar, Pipes, and colleagues) argue that Pekar et al. excluded these intermediate genomes on questionable grounds and that including them, together with the study's treatment of recombinants and sampling, materially weakens the two-spillover inference. Pekar, Wertheim, Worobey and co-authors counter that the reported intermediates are sequencing artifacts rather than authentic genomes—a position reinforced by later analyses finding the sequences are more likely erroneous or derived—so that their exclusion is warranted and the inference stands. The disagreement therefore turns largely on an empirical question that remains open: are the intermediate genomes real? Resolving it would require access to the underlying raw sequencing data and reads for the disputed samples, which have not been fully available for independent inspection.
Claim entered the graph