Common source outbreak In a common source outbreak<unk> , the affected individuals had an exposure to a common agent. If the exposure is singular and all of the affected individuals develop the disease over a single exposure and incubation course, it can be termed a point source outbreak. If the exposure was continuous or variable, it can be termed a continuous outbreak or intermittent outbreak, respectively. Propagated outbreak In a propagated outbreak, the disease spreads person-to-person. Affected individuals may become independent reservoirs leading to further exposures. Many<unk> s will have characteristics of both common source and propagated outbreaks (sometimes referred to as mixed outbreak). For example, secondary person-to-person spread may occur after a common source exposure or an environmental vector may spread a zoonotic diseases agent.
Epidemic
Epizootic
Endemic 
Pandemic
Toxoid
Acute 
Pre-medical
Infodemic