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English: 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]
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  1. REPORTED CASES OF NOTIFIABLE DISEASES IN THE AMERICAS 1949 - 1958. paho.org. Retrieved on 22 February 2017.

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current 05:42, 22 February 2017 Thumbnail for version as of 05:42, 22 February 2017804 × 701 (72 KB)WikisanchezUser created page with UploadWizard
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