A Yakima County resident died after severe illness linked to bird-flu exposure at an infected dairy.
Why it matters: The death is a severe, fatal outcome amid Washington's newly established cattle outbreak. Health agencies and agricultural businesses are monitoring contacts and looking for signs of wider transmission.
- The resident died November 1 after hospitalization for severe illness following exposure at a dairy with infected cattle.
- Yakima County reported three confirmed human avian-influenza cases and 33 affected dairy herds as of November 1.
- A third case was reported alongside the death; that patient was not hospitalized or severely ill.
- Officials said the general-public risk remains low and human-to-human transmission has not been documented in the United States.
A Yakima County resident died November 1 after being hospitalized with severe illness following exposure to avian influenza at a dairy with infected cattle, the Yakima Health District said.
The resident had underlying health conditions. Officials did not release the person's name, age, gender or occupation, citing family privacy. Health Officer Dr. Dave Atteberry said avian influenza can cause severe illness, particularly among people with underlying conditions.
Yakima County also reported a third confirmed human case. That resident had been exposed to infected dairy cattle but had not experienced severe illness or required hospitalization. The health district said it was identifying and contacting people who may have had close contact with either patient to monitor them for symptoms.
The county's situation page listed three confirmed human cases and 33 affected dairy herds as of November 1. The outbreak followed the USDA's October 8 confirmation of highly pathogenic H5N1 in two Washington dairy herds.
Officials said the general-public risk remains low, while dairy workers and others with close or prolonged contact with infected animals or contaminated environments face greater risk. Human-to-human transmission has not been documented in the United States.
CDC analysis of the deceased person's virus sequence found no changes known to make the virus spread more easily or cause more severe illness, according to The Associated Press. CDC surveillance reported no unusual influenza activity in people through September 26, while noting that some animal-linked case data are updated monthly.
By the numbers
- 3 - confirmed human avian-influenza cases in Yakima County as of November 1
- 33 - affected dairy herds listed by the county between October 8 and October 29
- 1,340 - people tested for novel influenza A since February 2022, according to CDC surveillance data through September 26
Yes, but: The fatal patient's specific underlying conditions, exact exposure activity and full viral subtype and sequence have not been released. Available evidence does not show person-to-person spread or genetic adaptation for easier human transmission.
What's next: Yakima Health District will monitor close contacts and update its avian-influenza webpage Mondays and Thursdays at 2 p.m. Pacific time.