In this article, we try to clarify what was the reason why the Avian Influenza virus persisted for a long time, once the last outbreak in the United States occurred in 2015, causing huge losses to the poultry industry.

Chronology of the virus presented in North America

– In 2015, the last outbreak of Avian Influenza occurred in the USA, being the most severe of the poultry industry in this country. This outbreak caused the loss of stocks of turkeys and laying hens, close to 6% and 9% respectively.
– The H5N8 high pathogenicity virus (clade originated in Asia, where it affected heavy and laying hens, specifically in South Korea.
– The migration of this virus to North American lands occurred through migratory birds. In December 2014 the virus was detected in Canada causing outbreaks in commercial chickens and turkeys. Using the Pacific migratory route, this virus arrived in 2015 in the northwest of the United States.
– Subsequently, the virus was able to recombine its genome with that of endemic viruses from North America, thus generating the high pathogenicity virus (HPAI) H5N2 that caused the debacle in the North Central area of ​​North America, being distributed through the central routes and the Mississippi River of migratory birds.

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