Canadian teenager in critical condition with presumptive bird flu as U.S. official warns the virus ‘seems to be gearing up for wider impact’
Health officials were struggling to answer a broader and potentially worrisome question: how the infection occurred.
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Bird flu viruses
The World Health Organization voiced alarm at the growing spread of H5N1 bird flu to new species, including humans, who face an ‘extraordinarily high’ mortality rate. Hong Kong should test for ...