Lesser-Known Strain of Bird Flu Kills 2 in China
The authorities said the two Shanghai men, 27 and 87 years old, fell ill after contracting the H7N9 strain in February and died in March.
Lesser-Known Strain of Bird Flu Kills 2 in China
The authorities said the two Shanghai men, 27 and 87 years old, fell ill after contracting the H7N9 strain in February and died in March.
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