H5N1 updates put cats and Dutch dairy surveillance in focus

A Washington State outdoor cat died after testing positive for H5N1, adding to evidence that cats remain highly susceptible to severe disease after exposure to infected birds or contaminated animal products. At the same time, Dutch investigators expanded follow-up testing on a Friesland dairy farm linked to an H5N1-positive cat and found antibodies in five cows, suggesting prior exposure without evidence of active viral shedding. Dutch authorities said PCR testing did not detect virus in the cows, while earlier reporting tied the first antibody-positive cow to mastitis and reduced milk yield in mid-December 2025. (wormsandgermsblog.com)

Why it matters: For veterinary professionals, the update reinforces two practical points: cats are still a high-risk spillover species, and cattle infections may be missed if surveillance relies only on overt illness. Washington state guidance has already urged veterinarians to ask about raw diets, raw milk, and wildlife exposure when cats present with respiratory or neurologic signs. In Europe, the Dutch finding is notable because it appears to be the first report of H5N1 antibodies in cattle there, even though authorities say the current public health risk remains low for the general population and low to moderate for exposed workers. (content.govdelivery.com)

What to watch: Watch for any additional Dutch serology results, evidence of virus detection in milk or cattle, and updated testing guidance for cats with wildlife, raw food, or dairy-farm exposure. (wormsandgermsblog.com)