Statistics also confirmed what every physician, indeed every person, already knew. In the civilian population as well, young adults had died at extraordinary, and frightening, rates. The elderly, normally the group most susceptible to influenza, not only survived attacks of the disease but were attacked far less often. This resistance of the elderly was a worldwide phenomenon. The most likely explanation is that an earlier pandemic (later analysis of antibodies proved it was not the 1889–90 one), so mild as to not attract attention, resembled the 1918 virus closely enough that it provided
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