how do epidemic spread
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These vectors may spread an epidemic by mechanical or biological transmission. ... The protozoan disease malaria is spread by the Anopheles mosquito vector. After an epidemic is introduced into a population by one or more persons, the infection spreads rapidly if there are enough susceptible hosts.
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Epidemics occur when diseases spread on a very wide scale and cause large number of deaths in a short span of time diseases like cholera, malaria, plague, measles, chicken pox spread due to unhygienic conditions after Floods, earthquakes etc.
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