You probably haven't thought about the bird flu in a couple of years, but a new strain that resurfaced in China has the potential to be pandemic. The H7N9 virus only caused mild illness in poultry until recently; a genetic change means the new strain is deadly for birds and humans. This new strain has led to more human deaths than any others in any season since H7N9 was detected in people four years ago. Related: 162 people perished from H7N9 between last September and March 1.
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