H2N2
H2N2 entered the human population in 1957 and circulated until 1968, when it was replaced by H3N2.
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Controlling Infectious Diseases »Controlling Infectious Diseases
Diseases »Diseases
Influenza »Influenza
Background about Flu »Background about Flu
Types of Flu? »Types of Flu?
Influenza virus type A »Influenza virus type A
Subtypes of Influenza virus type A »Subtypes of Influenza virus type A
H2N2
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