1957 flu pandemic | Cause, History, Deaths, & Facts | Britannica
https://www.britannica.com/event/1957-flu-pandemic
Web1957 flu pandemic, outbreak of influenza that was first identified in February 1957 in East Asia and that subsequently spread to countries worldwide. The outbreak caused an estimated 1,000,000 to 2,000,000 deaths worldwide and is considered to have been the least severe of the three 20th-century influenza pandemics.
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