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Bullet About Epidemic

The term epidemic has been derived from two Greek words, "Epi" means "upon " and "Demos" means "people". Thus, an epidemic of an infectious disease is the occurrence of a number of cases of a disease, known or suspected to be of infectious origin, that is unusually large or unexpected for the given place or time. An epidemic often evolves rapidly. A threatened (potential) epidemic is said to exist when the circumstances are such that epidemic occurrence of a specific disease may reasonably be anticipated. This requires a susceptible human population, the presence of a disease agent, and the presence of a mechanism or mode of large-scale transmission (e.g., contaminated water supply, poor sanitation and vector population) The unusual occurrence in a community or region of disease, specific health related behaviours. Some use the term "outbreak" for a small, usually localized epidemic in the interest of minimizing public alarm, unless the number of cases is indeed very large. This definition covers the usual epidemic diseases such as, measles, chickenpox, and cholera, which are compressed in time, but also the modern "slow" epidemics of non-communicable diseases like diabetic, heart attacks, and depression. Epidemics are Public Health emergencies.

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