Why did H1N1 re-emerge in 1977?

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Controlling Infectious Diseases
Diseases
Influenza
Background about Flu
Natural history of infection of influenza
Recovery from Flu?
Retain lifelong immunity to closely-related strains
Re-emergence of H1N1 in 1977
Why did H1N1 re-emerge in 1977?
Laboratory accident
H1N1 strains collected in 1957 and 1977 were nearly identical
Majority of illness occurred in individuals younger than 20 years
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