RT @Daoyu15: Vaccinia is the cattle-infecting relative of smallpox and was the very first effective vaccine that was used in humans against…
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Re-assembly of nineteenth-century smallpox vaccine genomes reveals the contemporaneous use of horsepox and horsepox-related viruses in the USA (2020) https://t.co/XjdNYzKu1D
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Yes, noted in later Tweet that crossed with this, but still not clear to me that there's consensus about origin and role of labs.
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@sciencecohen Not "labmade" and not "a mix of cowpox and smallpox." Cowpox virus and/or horsepox virus (https://t.co/7bDmqDVBlR; https://t.co/kcvZpmy0uJ).