In 1997, a strain of influenza virus jumped from birds to people in Hong Kong. It killed 6 of the 18 people it infected, a proportion that shocked scientists and public health officials worldwide (SN: 12/13/97, p. 372: http://www.sciencenews.org/sn_arc97/12_13_97/fob1.htm).
Although the flu didn’t spread from person to person, Chinese officials exercised extreme caution–ordering the slaughter of 1.4
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