Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus, which causes the disease avian influenza (often referred to as "bird flu"). It is enzootic (maintained in the population) in many bird populations, and also panzootic (affecting animals of many species over a …

Feb 25, 2024 · H5 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with several recent human cases in U.S. dairy and poultry workers. While the current public health risk is low, CDC is watching the situation carefully and working with states to monitor people with animal exposures.

Feb 10, 2025 · First case of avian influenza A H5N1 infection in a human in Nevada involves a dairy worker. Nevada just confirmed its first human case of avian flu from infected cattle. Nevada’s first case was...

Mar 7, 2025 · Bird flu, or H5N1 avian influenza, has been circulating across North America since 2022, infecting birds, livestock, wildlife, pets, and humans. Despite 70 documented human cases, there are no known instances of human-to-human transmission — but some scientists are starting to worry that it’s only a matter of time.

May 16, 2024 · H5N1 influenza virus infection can cause a range of diseases in humans, from mild to severe and in some cases, it can even be fatal. Symptoms reported have primarily been respiratory, but conjunctivitis and other non-respiratory symptoms have also been reported.

Dec 31, 2024 · Highly pathogenic avian influenza A (H5N1) viruses have caused widespread infections in dairy cows and poultry in the United States, with sporadic human cases. We describe characteristics of...

Dec 26, 2024 · HPAI A (H5N1) virus infection has been reported in wild mammals such as foxes, bears, seals, and sea lions, and in domesticated animals, including pets such as cats and dogs, farmed mink and foxes, and livestock such as goats and dairy cows.

Dec 31, 2024 · Highly pathogenic avian influenza (HPAI) A (H5N1) emerged in 1997. 1 Since then, it has spread globally by migratory birds, resulting in infections in animals on every continent.

Nov 4, 2024 · CDC provides an update on its response activities related to the multistate outbreak of avian influenza A (H5N1) virus, or "H5N1 bird flu," in dairy cows and other animals in the United States.

From 2003 to 2024, more than 950 cases of H5N1 bird flu in humans outside the United States were reported to the World Health Organization. About half of those have resulted in death. Visit the CDC’s webpage for the current status. Symptoms for people with bird flu can include: