H5N1 signals widen with Washington cat death and Dutch cow case

H5N1 surveillance picked up two developments that aren’t surprising, but are still important: a fatal infection in an outdoor cat in Washington state, and evidence of prior H5N1 exposure in a Dutch dairy cow. Together, they underscore a pattern veterinarians have been watching for months, with cats continuing to act as a visible spillover species and cattle surveillance widening beyond North America. (nationaltoday.com)

The Dutch finding followed a cat case on a Friesland dairy farm. After that cat tested positive, Dutch authorities sampled milk from 20 cows and a bulk tank milk sample. Wageningen Bioveterinary Research reported that none of the cows had detectable virus, but one cow had antibodies consistent with prior H5N1 infection. Investigators said that cow had shown mastitis and reduced milk production in mid-December 2025, then recovered. Restrictive measures were placed on the farm while follow-up testing proceeded, and officials said milk from the farm was directed only to pasteurized products. (wur.nl)

That distinction matters. Dutch and ECDC officials emphasized that this was evidence of past exposure, not proof of active viral shedding or ongoing transmission in the herd. ECDC said its risk assessment did not change after the report, keeping risk low for the general population and low to moderate for people with occupational or other direct exposure to infected animals or contaminated environments. The agency also noted that no confirmed human H5N1 cases had been reported in the EU/EEA as of January 27, 2026. (ecdc.europa.eu)

On the feline side, the Washington case fits a now-familiar pattern. Reporting around the January 27, 2026 state confirmation described an outdoor cat in Grant County that died after contracting bird flu, with likely exposure linked to infected wild waterfowl. That’s consistent with broader veterinary and public health guidance: cats are highly susceptible to H5N1, often become severely ill, and can be exposed through hunting, scavenging, raw poultry, raw milk, or contaminated pet food. FDA has already required covered cat and dog food manufacturers using uncooked or unpasteurized poultry or cattle materials to reassess food safety plans for H5N1 as a foreseeable hazard, citing domestic cat illnesses and deaths in multiple western states. (nationaltoday.com)

Recent feline research adds more context. A University of Maryland review published in Open Forum Infectious Diseases found a steep rise in reported avian influenza infections in cats starting in 2023 and called for more surveillance in domestic cats, especially high-risk groups such as dairy barn cats. International Cat Care’s response to that review echoed the same practical message for clinicians and pet parents: avoid raw poultry, unpasteurized milk, and unmanaged exposure to wild birds. California public health officials have similarly advised veterinarians to consider H5 infection in cats with neurologic signs after raw milk exposure and to discourage raw feeding. (today.umd.edu)

Expert and industry commentary has been less about surprise than about preparedness. Scott Weese’s framing on Worms & Germs is that these events highlight known vulnerabilities rather than a brand-new threat. AAHA has also urged clinics to tighten PPE use, collect better exposure histories, and communicate clearly with clients about animal, wildlife, and livestock risk. That’s especially relevant in mixed practice settings, where a cat on a dairy or poultry property may be the first obvious signal that something larger needs investigation. (aaha.org)

Why it matters: For veterinary professionals, the bigger takeaway is that H5N1 risk assessment can’t stay siloed by species. Small-animal teams need to ask about raw diets, unpasteurized dairy, hunting behavior, and livestock exposure. Farm and mixed-animal veterinarians need to pay attention when cats on a property get sick or die, because those cases may flag environmental contamination or unrecognized livestock exposure. And clinic biosecurity matters: AAHA and public health guidance recommend PPE when handling suspected cases, while FDA’s action on pet food shows regulators increasingly view companion animal exposure as part of the broader H5N1 control picture. (fda.gov)

What to watch: The next key signals are whether Dutch follow-up serology identifies additional exposed cattle, whether Europe documents any active bovine shedding rather than antibodies alone, and whether veterinary guidance evolves around testing, reporting, and PPE for cats linked to farms, wildlife exposure, or raw-fed households. (wur.nl)