← April 22, 2026 briefingHealth
Bird flu H5N1 vaccine human trial begins
A clinical trial of a vaccine targeting the H5N1 bird flu strain has begun, aiming to get ahead of a virus that has already decimated bird populations worldwide and carries pandemic potential if it gains the ability to spread between humans. The trial marks a significant step in pandemic preparedness efforts, even as H5N1 has not yet achieved human-to-human transmission.
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