H5N1 in companion animals raises new questions for vets
CURRENT BRIEF VERSION: Companion animals, especially cats, are part of the H5N1 risk picture in a way veterinary teams can’t ignore. Federal and academic guidance now points to several documented exposure routes for cats, including contact with infected wild birds, consumption of raw poultry or raw pet food, and ingestion of unpasteurized milk from infected dairy cattle. CDC, USDA, FDA, Cornell investigators, and AVMA reporting have all highlighted cats as particularly susceptible, with roughly 200 U.S. feline cases reported since late 2021 and nearly 70 documented this year alone. Reports range from fatal farm-associated infections to illness linked to contaminated raw milk and raw pet food, and experts have warned that H5N1 can persist for long periods in frozen or refrigerated raw diets. Dogs appear less commonly affected, but they’re not risk-free, particularly if they have contact with infected birds. (aphis.usda.gov)
Why it matters: For veterinary professionals, the practical message is to add H5N1 to the differential diagnosis for cats with acute neurologic or respiratory signs plus relevant exposure history, ask specifically about raw diets, raw milk, hunting behavior, and household dairy or poultry work, and use PPE when evaluating suspect cases. AVMA reporting also underscores that ongoing avian migration and spillover into prey species such as house mice may keep predation-related risk elevated for cats, even beyond obvious farm exposures. CDC has also warned that exposed veterinary staff and other caretakers may need symptom monitoring after contact with infected animals, underscoring the One Health implications for clinic workflows, client communication, and case reporting. (wwwnc.cdc.gov)
What to watch: Expect continued scrutiny of raw pet food and raw dairy exposure pathways, along with more guidance on testing, surveillance, and infection-control protocols for companion animal cases. One practical concern is product longevity: contaminated raw diets may remain a risk while frozen or refrigerated and can carry sell-by dates far into the future, extending the window for exposure. (fda.gov)