A-LevelBiologyInfectious diseasesOct/Nov 2019Paper 2 Q514 Marks
Influenza is an infectious disease caused by the influenza A virus. This virus causes influenza in birds and mammals. Fig. 5.1 is a diagram of an influenza A virus. Haemagglutinin allows the virus to attach to host cells by binding to receptors on the cell surface membrane of the host cells. Neuraminidase is an enzyme that helps the virus to leave host cells after the virus has replicated.
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