Health officials continue to monitor H5N1 closely after the recent death of an elderly Louisiana man. He was infected but experts found the virus mutations insufficient for increased human-to-human transmission.
The mutations identified in the Louisiana man suggest the virus began changing after he was infected. However, these mutations are not enough to enable the virus to spread more easily among people.
So far, infection rates in the U.S. indicate that H5N1 is not evolving in a manner that allows it to become more transmissible among humans.
The analysis done by CDC experts highlights ongoing efforts to understand how H5N1 operates, especially concerning its potential to develop adaptations for human transmission.
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