China’s Bird Flu Surge Is a Low Epidemic Threat, W.H.O. Says by DONALD G. McNEIL Jr.

By DONALD G. McNEIL Jr.

But the virus’s division into two strains will probably force development of a second small stockpile of emergency vaccine to be introduced if the virus becomes more transmissible.

Published: February 28, 2017 at 07:00PM

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