5 burning questions about Missouri’s mysterious H5 bird flu case
News that a person in Missouri contracted H5 bird flu despite having no known contact with infected animals or birds — in other words, no evident route of infection — raises pressing questions public health officials are surely scurrying to answer.
The rationale for that urgency is this: An unexplained H5 infection raises the possibility of person-to-person spread of a flu virus that has never before circulated in humans, in other words one to which people would not have immunity. And this with a dangerous flu virus that scientists have long feared could someday trigger a pandemic.
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