A new strain of bird flu has infected 130 and killed 40 people in China already this year. Take a look at history's four main flu outbreaks.
In February 1957, a new flu virus was identified in the Far East. Immunity to this strain was rare in people younger than 65. Vaccine production began in late May 1957 and was available in limited supply by August 1957.
Ralf Manteufel/Wikimedia Commons
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