Common Source Single Exposure Epidemic/Point Source Epidemic
● Exposure to the disease agent is brief
● All cases develop within one incubation period
● Epidemic curve rises and falls rapidly
Common Source Continuous Exposure Epidemic
● Exposure to the disease agent is prolonged
● Cases develop over more than one incubation period
● Epidemic is more extended
Propagated Epidemic
● Person to person transmission is present
● Epidemic shows gradual rise and persists for a longer period of time
● Spread depends on contact, secondary attack rate and herd immunity
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