WEB Avian influenza A bird flu viruses may be transmitted from infected birds to other animals and potentially to humans in two main ways Directly from infected birds or from avian influenza A virus. It can be transmitted freely within and among cervid populations. Take Action to Prevent the Spread of Flu Between Birds and People Influenza antiviral drugs can be used to treat influenza infections. WEB Elinor L Baron MD DTMH Since the early 20 th century there have been four. WEB Migratory birds especially waterfowl are a natural reservoir of the avian influenza virus They carry and exchange different virus strains along their migration routes leading to..
WEB Avian influenza A bird flu viruses may be transmitted from infected birds to other animals and potentially to humans in two main ways Directly from infected birds or from avian influenza A virus. It can be transmitted freely within and among cervid populations. Take Action to Prevent the Spread of Flu Between Birds and People Influenza antiviral drugs can be used to treat influenza infections. WEB Elinor L Baron MD DTMH Since the early 20 th century there have been four. WEB Migratory birds especially waterfowl are a natural reservoir of the avian influenza virus They carry and exchange different virus strains along their migration routes leading to..
Researchgate
**Avian Influenza: Understanding the Virus and Its Subtypes** **Introduction** Avian influenza, also known as bird flu, is a disease caused by infection with avian influenza Type A viruses. These viruses are highly contagious and can cause significant morbidity and mortality in birds. **Subtypes of AH7 Viruses** There are nine known subtypes of AH7 viruses: * AH7N1 * AH7N2 * AH7N3 * AH7N4 * AH7N5 * AH7N6 * AH7N7 * AH7N8 * AH7N9 **Transmission and Symptoms** Avian influenza viruses are primarily transmitted through direct contact with infected birds or their secretions. Humans can become infected through contact with infected birds or their contaminated environments. Symptoms of avian influenza in birds can include: * Respiratory distress * Swelling of the head and neck * Diarrhoea * Lethargy **Public Health Concerns** While avian influenza is primarily a concern for birds, it can also pose a risk to human health. Some strains of avian influenza virus have the potential to cause severe respiratory illness in humans, including: * Avian influenza A (H5N1) * Avian influenza A (H7N9) **Prevention and Control** Prevention and control of avian influenza include: * Biosecurity measures on poultry farms * Vaccination of poultry * Surveillance for infected birds * Early diagnosis and reporting of outbreaks * Protective measures for humans who interact with infected birds **Current Situation** In 2024, highly pathogenic avian influenza A (H5N1) has been detected in animals in several countries around the world. This strain poses a significant threat to poultry and wild bird populations, and is closely monitored by health authorities. Understanding the different subtypes of avian influenza viruses and their potential impact on both birds and humans is critical for effective prevention and control strategies.
**Deadly H5N1 Bird Flu Emerges in China** In 1996, a highly pathogenic avian influenza strain known as H5N1 was first discovered in domestic waterfowl in Southern China. The virus quickly spread, leading to outbreaks in poultry in 1997. In recent years, H5N1 has re-emerged as a significant threat to both poultry and humans. In 2022-2023, South Korea's national wild bird surveillance program detected 174 cases of highly pathogenic H5N1 viruses. **Outbreak Affects Dairy Cows in the US** The virus has also been found in dairy cows in the United States, raising concerns among scientists. This spread has been described as startling, given the global tracking of the virus. **Historical Context** The Asian H5N1 virus first came to attention in 1996 in Guangdong Province, China, where it caused the death of geese. However, it did not gain widespread recognition until it began spreading through live-poultry markets. **Public Health Implications** H5N1 is a serious threat to human health. While human infections are relatively rare, the virus has a high mortality rate in those who do become infected. It is important for people to take precautions to protect themselves from exposure to H5N1, including avoiding contact with infected poultry or poultry products. Researchers are working to develop vaccines and treatments for H5N1, but the virus remains a significant public health concern.
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**Avian Influenza Surveillance Dashboard Update** The USDA's Wild Bird Avian Influenza Surveillance Dashboard will be updated weekly on Wednesdays to reflect the latest data on avian influenza in North America. **New CDC Recommendations** The CDC has developed new interim recommendations for the prevention, monitoring, and public health response to avian influenza. These recommendations are based on the latest scientific data and best practices. **What is Avian Influenza?** Avian influenza (AI) is caused by an influenza type A virus that can infect poultry and other birds. The virus can cause a range of clinical signs, from mild respiratory symptoms to severe disease and death. **Distribution of Highly Pathogenic Avian Influenza** The USDA is currently tracking the distribution of highly pathogenic avian influenza (HPAI) in North America. HPAI is a highly contagious and deadly form of AI that can cause significant economic losses to the poultry industry. **USDA Resources** The USDA provides a variety of resources on avian influenza, including information on prevention, control, and response. These resources are available online at the USDA website. **For More Information** For more information on avian influenza, please visit the following websites: * USDA Wild Bird Avian Influenza Surveillance Dashboard: https://www.aphis.usda.gov/aphis/ourfocus/animalhealth/animal-disease-information/avian/avian-influenza/wild-birds * CDC Avian Influenza: https://www.cdc.gov/flu/avianflu/index.htm * USDA Avian Influenza: https://www.usda.gov/avian-influenza
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