H5N1 bird flu is evolving to better infect mammals, CDC study suggests

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H5N1 bird flu is evolving to better infect mammals, CDC study suggests
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Kamal Nahas is a freelance contributor based in Oxford, U.K. His work has appeared in New Scientist, Science and The Scientist, among other outlets, and he mainly covers research on evolution, health and technology. He holds a PhD in pathology from the University of Cambridge and a master's degree in immunology from the University of Oxford.

H5N1 bird flu is getting better at spreading between mammals but does not yet spread as easily as seasonal flu, a Centers for Disease Control and Prevention study suggests.

Related: 'Playing Russian roulette with your health': Officials warn that social media trend of consuming raw milk will not protect you from bird flu By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over."It doesn't mean that because the virus transmits in ferrets, it will transmit in humans," said Troy Sutton, a veterinary researcher at Penn State who was not involved with the study. Rather, it shows that the virus may be gaining in its ability to spread between mammals, he clarified.

When scientists deposited H5N1 directly into ferrets' noses, the animals developed severe symptoms — such as diarrhea, difficulty breathing and fever — and, in some cases, they died. By contrast, the infections among people in the U.S. have been quite mild, with minor symptoms, like eye redness.One possible explanation is that researchers administered millions of virus particles to the ferrets, which Sutton said is standard practice for flu studies in ferrets.

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