Did the 1918 flu mutate?
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Since the whole world had been exposed to the virus, and had therefore developed natural immunity against it, the 1918 strain began to mutate and evolve in a process called "antigenic drift...
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Since the whole world had been exposed to the virus, and had therefore developed natural immunity against it, the 1918 strain began to mutate and evolve in a process called "antigenic drift...
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