A resident of Washington state has been hospitalized after testing positive for an H5N5 bird flu infection, marking the first known human case of this strain in the United States. State health authorities confirmed that the patient is an older adult from Grays Harbor County with preexisting medical conditions and has been hospitalized since early this month. While federal officials continue to consider the overall public risk low, the case has drawn attention due to the virus’s novelty in humans and its potential for wider implications.
Investigators have not determined the exact source of the infection, but early evidence points to backyard poultry as a possible origin. Both health and agricultural agencies are actively investigating the circumstances surrounding this case to understand how transmission occurred. Avian influenza can be spread through an infected animal’s saliva, mucus, feces, and in some cases, milk from dairy cattle. Transmission risk tends to rise in late fall and winter when migratory birds come into contact with domestic flocks.
The current U.S. outbreak of avian influenza, which began in January 2022, has seen a notable increase in infections among mammals compared to previous episodes. Despite this, there has been no confirmed human-to-human transmission. Washington state officials are monitoring individuals who may have had close contact with the patient, offering testing and preventive treatment if needed.
Experts caution that the virus still presents serious concerns. Dr. Richard Webby highlighted the uncertainty surrounding its evolution, stating the virus has “pandemic potential.” He added, “I think it’s clear it’s not an easy leap for this virus to make, to switch from being a duck virus to being a human virus. I think that’s pretty clear, but I certainly wouldn’t put money on the fact that it can’t make that leap. It’s going to take a little bit of the biologic stars aligning for that to happen. We could argue exactly how likely that is, but no one actually knows. Only time will tell us, unfortunately.”
