PHAGE DISCOVERY. “Viruses that attack bacteria were observed by Twort and d’Herelle in 1915 and 1917. They observed that broth cultures of certain intestinal bacteria could be dissolved by addition of a bacteria-free filtrate obtained from sewage. The lysis of the bacterial cells was said to be brought about by a virus which meant a “filterable poison” (“virus” is Latin for “poison”).”
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