A resident of Yakima County, Washington, has died after a severe illness caused by H5N1 bird flu. It is the first virus-related death in the United States this year and the third since 2024. Two other state residents have been infected but have mild cases. The person who died had underlying health conditions; authorities have not disclosed their identity or other details. Genetic analysis of the virus found no changes suggesting increased transmissibility or severity.
Yakima County lies in the arid eastern part of the state, beyond the Cascade Mountains. Unlike the wetter, more densely populated west, the region has extensive irrigated farming and livestock operations. Agriculture is a mainstay of the local economy: the county grows apples, hops and grapes, and produces and processes agricultural goods.
H5N1 continues to spread among farm animals. Since March 2024, the virus has been detected in dairy herds in 21 states and has affected more than 1,200 cattle herds in total. In Washington, it has struck 40 herds since October and infected at least three people. It has also been detected in a wide range of species, from domestic cats to sea lions and polar bears.
The outbreak at a mink farm in Utah is a particular source of concern: the virus circulated there for at least five weeks before it was detected. Experts warn that keeping animals in close quarters gives the virus opportunities to change. Minks have respiratory tracts similar to humans’ and can provide an environment for viruses to mix. The risk of gene exchange also arises if a person is infected with both bird flu and seasonal flu at the same time.
According to reports, workers at the Utah farm were not tested for H5N1 even when they had symptoms, while the animals continued to be exposed to infection. In contrast to the United States, during an outbreak at a mink farm in Spain in 2022, authorities ordered all the animals to be culled; scientists then found a mutation that helped the virus spread among minks and other mammals. The United States has no federal requirements for responding to outbreaks at mink farms and no compensation program for their owners.
State authorities are usually the first to respond to outbreaks: they investigate, impose local restrictions and coordinate with farmers. Federal agencies, primarily the U.S. Department of Agriculture, can provide scientific and financial support, set nationwide rules and coordinate measures when a disease spreads across state lines or affects trade. The specific division of responsibilities depends on the disease and the animals or plants affected.
Experts criticize the authorities’ inadequate response and warn that inaction gives the virus opportunities to spread and evolve. The U.S. Centers for Disease Control and Prevention expressed condolences but did not hold a public briefing; the Department of Agriculture said that the state is coordinating the response at the Utah farm. The genetic samples analyzed so far show no significant worsening of the virus’s properties, but they were collected in early August, so further changes are unknown. It is also unclear how the virus reached the farm and why it spread so quickly among herds in Washington.
Based on: Bird flu death in Yakima County renews concern over the virus