New flare-ups have caused significant economic harm and raised concerns about the prospect of avian flu mutating into a strain that is easily transmitted between humans.

The strains causing widespread outbreak now – avian influenza A (H5N1) 2.3.4.4b viruses – first arose in 2020 and spread via migratory birds to Africa, Asia and Europe, according to the World ...

Since 2022 in the US, the avian flu H5N1 virus has been detected in more than 200 mammals. In March 2024, a multistate outbreak of this virus was reported in dairy cattle.

More than 300 dead wild birds have been collected by Michigan's Department of Natural Resources in 2025. Avian flu is suspected in the mass deaths.

An outbreak of highly pathogenic avian influenza (HPAI) in chicken and turkey flocks has spread across 24 U.S. states since it was first detected in Indiana on Feb. 8, 2022. Better known as bird ...

California wildlife is vulnerable to an avian flu ‘apocalypse.’ What is driving the spread? A California Department of Food and Agriculture technician performs a culture swab on a rooster to ...

The new bird flu discovered in China has killed or critically sickened more than half of all people who've caught it. ... Know the Signs of Avian (Bird) Flu H7N9.

Signs outside all of the habitats explain why: A new strain of bird flu, or avian flu, has spread quickly since Colorado identified its first case in February, and the zoo is trying to keep its ...

The bird flu, also known as the avian flu, refers to the disease caused by a family of flu viruses primarily transmitted between birds. The dominant virus strain circulating currently is called H5N1.

The U.S. is enduring an unprecedented poultry health disaster, with a highly contagious bird flu virus triggering the deaths of some 52.7 million animals. The culprit is highly pathogenic avian ...

Avian influenza, commonly known as bird flu, ... It's not new: highly pathogenic bird flu H5N1 was discovered more than 20 years ago and there have been outbreaks in different parts of the world.