Talk:Timeline of influenza
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Reported cases of influenza in American countries for the period 1949-1958, illustrating the severity of influenza A virus subtype H2N2 pandemic in 1957. Chile (not shown in the graph) was severely hit and reported 1,408,430 cases in 1957.[1]
- ↑ "REPORTED CASES OF NOTIFIABLE DISEASES IN THE AMERICAS 1949 - 1958" (PDF). paho.org. Retrieved 22 February 2017.
