Roger That Roger Federer shirt . They knew there were very small organisms that passed through the smallest filters, but they didn’t know if they were bacteria or a different kind of organism. They understood that bacteria could mutate and change as they passed through people and reproduced. They recognized, in retrospect, that it was the same virus in the first wave and the second wave, but that it had changed. However, it then began to mutate in the direction of ordinary influenza viruses. There was a third wave in the spring of 1919, and it was pretty lethal, but nothing like the second wave. The virus hung around, and viruses circulating today are still descendants of the 1918 influenza virus — some elements of it, anyway.
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