Asian HPAI H5N1 influenza virus
Asian HPAI H5N1 influenza viruses are avian influenza A viruses that originate from Asia and that cause severe illness and death in poultry (this means the viruses are “highly pathogenic” and these viruses are called “highly pathogenic avian influenza” or “HPAI” for short). These viruses were first detected in 1996 in geese in China. Asian HPAI H5N1 virus infection in humans was first detected in 1997 during poultry outbreaks in Hong Kong and has since been detected in poultry and wild birds in more than 60 countries in Africa, Asia, Europe, and the Middle East since 2003. HPAI H5N1 is regularly found (i.e., “endemic”) in poultry in six countries: Bangladesh, China, Egypt, India, Indonesia, and Vietnam. Asian HPAI H5N1 viruses have also infected other kinds of animals (e.g., dogs, cats, pigs, tigers, leopards, and stone martens). Asian HPAI H5N1 viruses are different from the HPAI H5N1, H5N2, and H5N8 viruses that have been detected in U.S. wild birds and poultry since December 2014.
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