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Source of person's recent bird flu case remains a mystery — and experts say that's concerning
The latest human case of bird flu in the U.S. occurred in a patient with no reported exposure to affected animals, sparking questions over whether the virus is spreading between people. Experts say that's unlikely but argue the case raises other concerns.
News analysis
Could bacteria-killing viruses ever prevent sexually transmitted infections?
The CDC will soon recommend that some people take a "morning-after" antibiotic to lower their risk of STIs. But someday, it's possible that bacteria-killing viruses could do this without driving antibiotic resistance.
News analysis
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