Could bird flu be quietly spreading undetected worldwide?
Gavi, the Vaccine Alliance
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November 6 2025
A strain of bird flu that has caused the death of mammals since 2020 is now suspected to have a deadly new skill: spreading undetected in people.
A review by the CDC’s Fatimah Dawood and colleagues in JAMA Network Open found that asymptomatic H5N1 infections have been reported in several countries.
