2025年3月20日 · 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. Many other species are also susceptible to this virus. APHIS is working with our Federal, State, and industry partners to combat outbreaks, support producers, and strengthen prevention.

3 天之前 · 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.

2025年3月19日 · Historically, the mortality rate from avian influenza A(H5N1) observed globally has been around 50%; however, only one of 70 human infections* in the United States to date has resulted in death. Recent studies have reported that ferrets previously infected with seasonal influenza A(H1N1) virus had less severe illness from H5N1 bird flu.

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 …

2025年2月26日 · CDC provides an update on recent developments in the multistate outbreak of avian influenza A(H5N1) virus, or "H5N1 bird flu," in dairy cows, poultry, and other animals in the United States.

2024年5月16日 · 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.

2024年12月31日 · 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.

2024年12月31日 · 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...

2025年1月7日 · Avian influenza A (H5N1), or bird flu, is spreading among cows in the United States. A Yale Medicine expert tells you what you need to know to stay safe.

2025年3月20日 · Since 2022, H5N1 has been infecting chickens, cows, wild birds and cats — among several other animals. With a record number of human cases in the U.S., the situation is getting increasingly ...