When the H5N1 bird flu virus jumps from animals into people, it hits a dead end. Missing the key genes that would help it infect humans, it isn’t causing a pandemic. But if the virus suddenly ...

When highly pathogenic avian influenza (HPAI) H5N1 was detected in U.S. dairy cattle in March 2024, it sparked a wave of research. Scientists at USask’s Vaccine and Infectious Disease Organization ...

Samples from each of Minnesota's 1,625 permitted dairy farms will undergo testing once a month for H5N1, the virus commonly known as bird flu. (Elizabeth Flores/The Minnesota Star Tribune) ...

Bird flu, or avian influenza, is classified into various strains based on two proteins found in the virus—hemagglutinin (H) and neuraminidase (N). The H5 and H9 designations refer to different types ...

The combination of these proteins defines the virus subtype, such as H5N1 or H5N9. There are nine known subtypes of A(H5) viruses - A(H5N1), A(H5N2), A(H5N3), A(H5N4), A(H5N5), A(H5N6), A(H5N7), A ...

Different blends of those two proteins alongside many other mutations elsewhere in the virus can affect how sick people and animals get and how it spreads. H5N1 has been the dominant grouping of ...

So far, bird flu outbreaks in the U.S. have been from a strain of highly pathogenic avian influenza (HPAI) called H5N1. That strain ... form of the influenza A virus that causes highly pathogenic ...

APHIS also confirmed six additional cases of H5N1 in California's dairy herds, raising further alarms over the virus's spread to mammal species. One person in Louisiana has been reported dead ...

Concerns about H5N1, which has been known and studied for more than a decade, have been rising since a death was linked to the virus in Louisiana earlier this month. H5N9 is a less researched ...

SACRAMENTO, California – 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 ...

The U.S. reported its first H5N9 bird flu case at a California duck farm, according to WOAH. Authorities also found H5N1 there, leading to the culling of 119,000 birds. H5N1 is the more common strain, ...

A new strain of bird flu — H5N9 — has been detected in California’s Merced County at a commercial duck operation. According to the World Organization for Animal Health — an international ...