Cats that became infected with bird flu might have spread the virus to humans in the same household and vice versa, according to data that briefly appeared online in a report from the Centers for Disease Control and Prevention but then abruptly vanished. The data appear to have been mistakenly posted but includes crucial information about the risks of bird flu to people and pets.
In one household, an infected cat might have spread the virus to another cat and to a human adolescent, according to a copy of the data table obtained by The New York Times. The cat died four days after symptoms began. In a second household, an infected dairy farmworker appears to have been the first to show symptoms, and a cat then became ill two days later and died on the third day.
The virus, called H5N1, is primarily adapted to birds, but it has been circulating in dairy cattle since early last year. H5N1 has also infected at least 67 Americans but does not yet have the ability to spread readily among people. Only one American, in Louisiana, has died of an H5N1 infection so far.
Experts said that the finding that cats might have passed the virus to people was not entirely unexpected. But they were alarmed that the finding had not yet been released to the public.
Scientists have long known that cats are highly susceptible to the virus. At least 85 domestic cats have been infected since late 2022, according to the U.S. Department of Agriculture. But there had not previously been any documented cases of cats passing the virus to people.
“Given the number of cats in the U.S. and the close contact with people, there is definitely a need to understand the potential risk,” said Dr. Diego Diel, a veterinarian and virologist at Cornell University.
H5N1 is often fatal in cats, which may develop severe neurological symptoms. Historically, H5N1 has primarily affected birds. But over the last several years, new versions of the virus have proved capable of infecting a wide range of mammals, including wild and domestic cats, seals and dairy cows. Infections in mammals give the virus more opportunities to evolve in ways that could allow it to infect humans more easily.
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