influenza virus

influenza virus
Member of the Orthomyxoviridae that causes influenza in humans. There are three types of influenza virus; Type A causes the world-wide epidemics (pandemics) of influenza and can infect other mammals and birds; Type B only affects humans; Type C causes only a mild infection. Types A and B virus evolve continuously, resulting in changes in the antigenicity of their spike proteins, preventing the development of prolonged immunity to infection. The spike proteins, external haemagglutinin (HA) and neuraminidasehave been studied as models of membrane glycoproteins.

Dictionary of molecular biology. 2004.

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