First Death from H5N5 Bird Flu Reported in Washington

Health officials in Washington have reported the death of the first person infected with the H5N5 bird flu.

The individual, residing in Grays Harbor County, was hospitalized earlier this month in Kings County, which is where Seattle is located.

Details about the person’s name, age, or gender were not disclosed. However, a news release from local health officials last week indicated that the individual was considered “older” and had pre-existing health conditions. Symptoms included a high fever, confusion, and difficulty breathing.

This person maintained a backyard flock of various domestic poultry.

Testing from the health department detected the virus in the flock’s environment, suggesting exposure likely came from either the domestic birds, their surroundings, or wild birds.

State health officials are currently monitoring others who may have been in contact with the flock and its environment.

The H5N5 strain of bird flu, which had not previously been reported in humans, first emerged in 2023, impacting birds and mammals in eastern Canada.

Research published last year indicated that some infected animals had a mutation in the virus that facilitates easier transfer between mammals.

There are concerns among epidemiologists and virologists regarding the potential for avian influenza to lead to a pandemic if it continues to spread and mutate. For instance, the circulating H5N1 virus in dairy cattle in North America is reportedly “one mutation away” from gaining the ability to spread easily among humans.

Each instance of bird flu infecting a person raises alarms that it could evolve, possibly becoming more transmissible or deadlier. If an infected individual has another flu virus in their system, there’s potential for the two viruses to swap genetic material, which could lead to dangerous mutations.

Despite these concerns, health officials maintain that the general public’s risk remains low. No other individuals connected to the case have tested positive for avian influenza, and there’s no current evidence of human-to-human transmission. Monitoring of close contacts with the patient is ongoing.