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Types Of Epidemics
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There are two major types of infectious diseases which can develop into epidemics: common source and host-to-host.

Common source epidemics arise from a contaminated source, such as water or food, while host-to-host infections are transmitted from one infected individual to another via various, perhaps indirect routes.

Common source epidemics usually produce more new cases earlier and faster than host-to-host epidemics. Once the infected source is closed, sealed, or removed, the common source epidemic usually abates rapidly. Host-to-host epidemics are slower to grow and slower to diminish. Anything causing disease is called a pathogen.

A vector is an organism that serves as an intermediary in the transmission of a host-to-host disease. For instance, many infections are transmitted by mosquitoes, fleas, ticks, etc. to people. A fomite is any inanimate object that adheres to or transmits infectious material, e.g., bedding, clothing, surgical instruments, etc.

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