نبذة مختصرة : Influenza B (Li) virus particles. The particles are surrounded by spikes consisting of haemagglutinin and neuraminidase proteins embedded in the viral membrane. Both A and B types can cause the epidemic forms of the disease and flu vaccines offer protection to both strains of the virus. Influenza B does not undergo the large, rapid changes that type A does but changes slowly by the process of antigenic drift.
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