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Influenza Encyclopedia

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The author considers theories of the origin of the 1918 pandemic in the context of the general history of influenza, which he argues "probably existed for several centuries" and "can be traced back with a fair degree of certainty to the fifteenth century and it is generally agreed that it must have been prevalent before that time." Observes that, with regard to the origin of the 1918 pandemic, it "is believed by some writers to have originated somewhere in Western Asia, others speak of it as having started in Spain." Notes that "as to the bacteriology of the disease little work had been done up until the great pandemic of 1889-90."

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