Bird flu viruses appear to replicate and thrive at temperatures higher than a typical fever—one of the body’s key protective ways of stopping viruses.

This threat to human health has been outlined in new international research led by the University of Cambridge in England and the University of Glasgow in Scotland, shedding new light on how fever stops viruses and why some viruses can survive.

This follows reports of an “older adult” from Washington in the U.S. dying from a strain of the bird flu virus called H5N5 on November 21, 2025.

“Testing at the UW Medicine Clinical Virology Lab identified the virus as H5N5, making this the first recorded infection with this variant in a person globally. The result was confirmed by the Centers for Disease Control and Prevention (CDC),” said the

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