REDWOOD CITY, Calif. — A stray cat in San Mateo County has tested positive for the H5N1 avian influenza virus, according to a February 6 press release from the San Mateo County Executive Office.
The infection was confirmed by state veterinarians and health officials after the cat, recently adopted by a family in Half Moon Bay, showed signs of illness. The family brought the cat to the Peninsula Humane Society, where a veterinarian ordered lab tests. The results confirmed an H5N1 infection.
The cat was euthanized due to the severity of its condition. Officials say it’s unclear how the animal was infected, but the case is not linked to recent outbreaks of bird flu in backyard cats.
Cats can contract avian influenza by eating infected birds, contacting contaminated environments, or consuming unpasteurized milk from infected cows. Pets that roam outdoors, such as cats and dogs, are at greater risk.
The Centers for Disease Control and Prevention (CDC) reports that the risk of cats spreading H5N1 to humans is extremely low. However, cats can carry and spread certain strains of avian influenza.
While no human cases have been linked to this infection, officials urge pet owners to stay alert for symptoms. Infected pets may show weight loss, lethargy, fever, and neurological issues like seizures or blindness. Breathing problems and eye or nose swelling may also occur, and in severe cases, the illness can be fatal.
“If your pet is sick, your veterinarian can determine if testing for avian influenza or other diseases is needed,” said Lori Morton-Feazell, director of the San Mateo County Animal Control and Licensing Division.
Pet owners who notice signs of illness in animals exposed to wild birds or poultry should contact a veterinarian immediately.
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