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What does infecting dose mean?

it is the severity of exposure


What is the immunity rate after infection dependent on?

dependent on the organism and its infecting dose, immunity of person e.g. chickenpox


how does menin occur?

N meningitidis
young people get it more which means when you are young you are more susceptible to it and it is very infectious. occurs in the winter months near the coastal areas. 4% die on average a year. 1/100 develop disease and less. 3 days to develop disease(incubation period). can be asymptomating.