H5 Bird Flu: Current Situation | Bird Flu | CDC
6 days ago · CDC provides an update on recent developments in the multistate outbreak of avian influenza A (H5N1) The current outbreak began in late March 2024 with the detection of H5N1 bird …
Influenza A virus subtype H5N1 - Wikipedia
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 …
Highly Pathogenic Avian Influenza A(H5N1) Virus Infections in Humans
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 …
Influenza: A (H5N1) - World Health Organization (WHO)
May 16, 2024 · H5N1 is one of several influenza viruses that causes a highly infectious respiratory disease in birds called avian influenza (or "bird flu"). Infections in mammals, including humans, have …
H5N1 Influenza - Animal and Plant Health Inspection Service
Sep 15, 2025 · The H5N1 strain of highly pathogenic avian influenza (HPAI) is present in wild birds worldwide and is causing outbreaks in U.S. domestic birds and dairy cattle.
Ecology and spread of the North American H5N1 epizootic
Nov 12, 2025 · The panzootic of highly pathogenic H5N1 since 2021 was driven by around nine introductions into the Atlantic and Pacific flyways, followed by rapid dissemination through wild …
Confirmed case of highly pathogenic avian influenza confirmed in duck ...
4 days ago · H5N1 is a highly infectious and often lethal subtype of influenza A that primarily affects birds but can sometimes be transmitted to humans.
Avian Influenza (Bird Flu): H5N1, Causes, Symptoms & Treatment
Dec 5, 2024 · A type of influenza A virus, often H5N1 in humans, causes bird flu. The virus can infect your upper respiratory tract and lungs, and sometimes spread to other parts of your body like your …
Wild birds are driving the current U.S. bird flu outbreak
Nov 12, 2025 · Penn Vet’s Louise Moncla has tracked H5N1 viruses in North America to better understand the role wild birds play in the current bird flu outbreak.
Highly pathogenic avian influenza H5N1: history, current situation, and ...
Human H5N1 infections have concurrently increased, as exposures to infected animals have become more frequent. The risk of an H5N1 influenza pandemic continues to grow.