Olympia, Washington — A Washington state resident has died from complications linked to a strain of bird flu, H5N5, that has not been previously documented in humans, according to the state’s Department of Health. This case marks a significant development, being the first human infection of bird flu reported in the United States in nine months and only the second human fatality attributed to the virus in the country.

The deceased was an older adult with preexisting health conditions who had been under hospitalization for the bird flu infection. Health officials state the individual had a backyard flock of domestic birds, with investigations indicating that exposure to this flock or nearby wild birds likely contributed to the infection.

Authorities have been monitoring those who were in close contact with the individual, but thus far, no additional cases of avian influenza have emerged, and no evidence suggests human-to-human transmission. The U.S. Centers for Disease Control and Prevention (CDC) has reassured the general public that the risk of widespread infection remains low.

Bird flu has historically affected wild bird populations across the globe for decades, but the recent U.S. outbreak, which began in January 2022, has shown an alarming propensity for transmission among mammals. The CDC reports that there have been 70 human cases reported during this outbreak, including another death occurring earlier this year involving a similarly vulnerable elderly individual.

While most infected individuals have experienced mild symptoms, the potential for severe illness exists, particularly for those with underlying health issues. Symptoms in mild cases have included red eyes and fever, typically affecting people who work closely with animals. The CDC highlights 41 cases among cattle workers and 24 cases involving poultry workers, with other exposures accounting for several additional instances.

To protect themselves, individuals in close contact with birds or livestock are advised to use appropriate protective gear and exercise caution around animal waste. Officials recommend that people take care when cleaning bird feeders and avoid interacting with sick or deceased wildlife.

Additionally, the Washington Department of Health advocates for flu vaccinations for those who may come into contact with domestic or wild birds. Although the seasonal flu vaccine does not offer protection against avian influenza, it may mitigate the chances of dual infections that could facilitate mutations of the virus, potentially increasing its transmissibility among humans.

The state’s health department continues to urge individuals to stay informed about avian influenza and prioritize safety measures when dealing with potential sources of infection. As monitoring efforts progress, public health officials remain vigilant in their response to this evolving situation.