What happened in Yakima County
A person in Yakima County, Washington, has died after contracting avian influenza from exposure to infected dairy cows, county health officials said Sunday. According to CNN, it is the first known death from bird flu complications in the United States in 2026. It is also the third since February 2024, when the virus first jumped into dairy cattle.
The Yakima County Health District said on October 31 that a person who had been in contact with infected cattle was hospitalized with a severe case. The person had underlying health conditions, though the county did not say what they were. The county reported the death on November 1.
Officials said they are closely monitoring the person's contacts to make sure no one else was infected.
Three human cases and a growing number of herds
The death is one of three human cases identified in the Yakima County Health District this year. The first was a mild case found last month, the second was the person who died, and a third was reported over the weekend. That third case also has mild symptoms and has not led to hospitalization, county officials said. All three cases occurred since mid-October and came from exposure to infected cows.
State health officials said they have reported all three cases to the Centers for Disease Control and Prevention. According to CNN, the agency had not yet added them to its bird flu dashboard.
Since October 8, 33 dairy herds infected with H5N1 have been reported in Washington. The state is urging dairy workers to wear personal protective equipment and to report symptoms if they feel ill. On October 15, a dairy worker in the county tested positive for a mild case, the first human case reported in the US in nearly a year.
How officials are tracking the outbreak
Dr. Dave Atteberry, the public health officer for the Yakima health district, said the affected dairies were found in early October through milk testing by the Washington State Department of Agriculture and the US Department of Agriculture. County public health workers then contacted the farms and enrolled dairy workers in a text-based screening tool. It checks each day for symptoms such as cough, fever or red eyes, and the health department follows up with more questions if a worker reports any.
Atteberry told CNN last month, “We’re throwing a large net so that we capture everybody that that potentially could be getting exposed.” The goal, he said, is to focus on those who were exposed and get them treated.
Workers who test positive receive antiviral medication to treat their symptoms and lower their viral load, which could reduce the chance of passing the virus on. Atteberry noted that person-to-person spread has not been seen biologically, adding, “We’re doing it out of an abundance of caution.”
Broader picture and expert concern
The CDC has recorded bird flu cases in more than 70 people in the US since 2024. Most worked on farms with infected cattle or poultry. Health officials say most cases have been mild and all have been dead-end infections, in which the virus passes from an animal to a person but goes no further. No human-to-human transmission has been documented in the US, and officials continue to say the risk to the public is low.
Some experts are still worried. Dr. Jennifer Nuzzo, who directs the Pandemic Center at Brown University’s School of Public Health, said the state-by-state approach to monitoring human infections is concerning. CNN noted that ProPublica recently reported that Utah's agriculture department agreed to share information about farm outbreaks as long as health officials did not track workers' health. Nuzzo said, “our picture of H5N1 is the murkiest it’s ever been.”
She also pointed out that the rise in Washington dairy infections has coincided with very early seasonal flu circulation on the Pacific Coast. That overlap, she said, could allow H5N1 to swap pieces of its genome with seasonal flu viruses, potentially giving it tools to infect humans more easily. “That is the bad scenario,” Nuzzo said.
