Tests done on a Chilean man infected with bird flu showed signs that the virus has partially adapted to spread between mammals.
MONDAY, April 17, 2023 -- However, the public health risk still remains low, U.S. health officials say.
While the two mutations seen in the PB2 gene can help the virus replicate in mammals, the samples did not have other genetic changes that would enable the virus to stabilize and bind tightly to human cells, according to the CDC. No other cases have been linked to the man infected with the virus known as H5N1. His case began with a cough and a sore throat, according to the World Health Organization, which received a report of the man’s illness on March 29 from Chile’s Ministry of Health.
“According to the preliminary findings of the local epidemiological investigation, the most plausible hypothesis about transmission is that it occurred through environmental exposure to areas where either sick or dead birds or sea mammals were found close to the residence of the case,” WHO officials said.
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