Comment by David Bahry

Worobey et al. argue that the clustering of early cases around HSM, and within HSM the clustering of positive environmental samples in the southwestern corner of the market near most wildlife stalls, indicate that SARS-CoV-2 spilled over at HSM. Yet their arguments are circular, based on dismissing clear, known sampling bias in the data: authorities initially (understandably) assumed an HSM zoonosis, so that was what they largely looked for.