A 30-year-old man from southwest Cambodia's Kampot province had been confirmed positive for H5N1 human avian influenza, becoming the first case of this year, the Ministry of Health said in a statement on Saturday.

Flu cases in New York City have surged to their highest level in more than a decade, with signs of widespread illness visible across the city.

A Washington state resident has tested positive for bird flu, marking the first human case in the U.S. in nine months. The patient, an older adult with underlying health conditions, was hospitalized in early November with high fever, confusion, and respiratory distress, according to the Washington State Department of Health (WSDOH).

The U.S. Centers for Disease Control and Prevention said on Thursday its analysis of samples from the first severe case of bird flu in the country last week showed mutations not seen in samples from an infected backyard flock on the patient's property.