Influenza is an infectious disease that primarily presents with respiratory signs and symptoms, caused by RNA viruses. The most significant impacts of influenza viruses on humans are those arising from the influenza A strains. The natural reservoir of influenza A strains is a diverse pool of viruses among aquatic wild bird populations, the avian influenza (AI) viruses. These viruses are divided into those of high and low pathogenicity (hence HPAI and LPAI), according to their severity in the avian species they usually infect. HPAI epizootics continue to be documented worldwide all due to the A/H5 and A/H7 virus groups.
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