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| Antigenic shift Changes in proteins in the outer envelope of a virus, resulting from the reassortment of viral genes. Major epidemics of influenza occur after antigenic shifts have taken place, because individuals are not immune to the substantially modified viruses.
Read more about this term in the Online Textbook: Emerging Infectious Diseases: Animal Reservoirs Related Terms: Antigenic drift Related Images: Antigenic shift in the influenza virus Related Animations: Antigenic Shift View QuickTime Movie Influenza Infection View QuickTime Movie
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