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H1N1 strains collected in 1957 and 1977 were nearly identical

H1N1 strains collected in 1957 and 1977 were nearly identical, both antigenically and genetically.

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Re-emergence of H1N1 in 1977
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H1N1 strains collected in 1957 and 1977 were nearly identical
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Why did H1N1 re-emerge in 1977?
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Majority of illness occurred in individuals younger than 20 years
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