Influenza Transmission and Symptoms
Spread by droplet infection. Infection confined to the respiratory tract - there is no viraemia. Incubation period 1-3 days. Three types. Influenza A: causes epidemics and pandemics; has a reservoir in birds, undergoes antigenic shift - sudden major change in antigenicity based on recombination between different strains. Influenza B: causes ... ................
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