The influenza virus was identified in:
A team of the Medical Research Council published it in the The Lancet journal on July 8th, 1933. In the 1918 pandemics, that caused 40 million deaths, it was thought that the disease was caused by a bacterium. Back in those days, there were no tests for viruses, and therefore its presence had to be worked out when the infectious agent couldn't be filtered, seen nor cultured but it caused the disease anyway.
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