San Diego City Wire

San Diego County health officials are investigating a potential case of bird flu (H5N1) in a domestic cat from East County. Preliminary tests indicate that the cat, which fell ill and died in mid-January 2025, tested positive for the virus. The cat is believed to have contracted the infection through consuming raw pet food.

This marks the first instance of bird flu in a cat within San Diego County. Similar cases have been reported across California, with raw food or milk being suspected as the common source of infection.

Bird flu, also known as H5N1, is a highly contagious virus affecting birds and other animals. In 2024, six wild gulls in San Diego County were confirmed to have bird flu. However, no wildlife cases have been documented so far in 2025, nor have there been any reported human cases locally.

Although transmission to humans is rare, it can occur if the virus enters through the eyes, nose, mouth, or via inhalation. Dr. Seema Shah from the County Epidemiology and Immunization Services Branch stated: “Bird Flu has been devastating for wildlife populations around the globe, poultry and dairy cattle in our country and has infrequently affected people and cats.” She added that the county is actively monitoring wildlife and expanding testing efforts while collaborating with veterinarians and healthcare providers to offer guidance.

On the West Coast, similar fatalities among house cats due to bird flu linked to raw food consumption have occurred in counties such as Santa Barbara and Los Angeles, as well as states like Washington and Oregon.

Symptoms of bird flu in cats include neurological issues such as lack of coordination or seizures, respiratory problems like sneezing or coughing, and loss of appetite. Pet owners are advised to consult their veterinarian if their pet shows symptoms after consuming raw food or interacting with potentially infected animals.

Those most at risk include farmworkers and individuals who handle poultry or wildlife. The use of personal protective equipment is recommended for those working with sick animals to minimize exposure risk.

Further information on bird flu is available on the county's website for healthcare professionals and veterinarians seeking guidance.