@AnonymousSage1 @HollyMacRell22 @Alec_Zeck @3dom13 Proof of virus infection: 1929, biologist Francis Holmes used the tobacco mosaic virus in a local lesion assay which provided the first evidence viruses were discrete infectious particles. That’s proof. Ea
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Scholthof, "Making a Virus Visible: Francis O. Holmes and a Biological Assay for Tobacco mosaic virus" http://t.co/h4zQ7ftYYP #histsci