The virus was reported in a commercial flock of ducks. It’s the first time the subtype has been detected in the United States.

A new strain of a highly pathogenic and rare strain of bird flu has been reported on a duck farm in central California.

Bird flu infections around the U.S. have forced mass cullings and resulted in the deaths of zoo animals and pets

A newly identified strain of bird flu, H5N9, discovered at a California duck farm, has prompted concerns about the possibility of a larger outbreak, The Washington Post reported Jan. 29. Health experts are monitoring the situation, particularly the potential for genetic mutations that could make the virus more easily transmissible among humans.

U.S. authorities also detected the more common H5N1 strain on the same farm in Merced County, California, they said in a report to Paris-based WOAH, adding that the almost 119,000 birds on the

The H5N1 virus has a ways to go before it can successfully jump to humans but that it doesn’t reduce the threat it poses.

US officials are investigating the appearance of a strain of bird flu identified in the US for the first time, a worrying sign that the virus is evolving in ways that could make it harder to

According to the Centers for Disease Control and Prevention, 67 people in the U.S. have been infected with H5N1 bird flu. One person has died.

First U.S. detection of virulent H5N9 strain, at a California duck farm, draws scrutiny as evidence of genetic reassortment that could trigger human outbreaks.

H5N9 is a rare subtype of the influenza A virus that can cause ... authorities identified the more common H5N1 strain on the same farm in Merced County, California. In a report to the Paris ...

The findings come at a time when outbreaks of bird flu -- a different subtype of the ... of the highly pathogenic avian influenza (HPAI) H5N1 influenza virus currently circulating