what is pandemic? how it spread?
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pandemic is a deadly disease which spreads in countries or the whole world
spread of pendemic depends on nature of disease ( viral , bacterial or any other)
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A pandemic is defined as “an epidemic occurring worldwide, or over a very wide area, crossing international boundaries and usually affecting a large number of people”. The classical definition includes nothing about population immunity, virology or disease severity.
By this definition, pandemics can be said to occur annually in each of the temperate southern and northern hemispheres, given that seasonal epidemics cross international boundaries and affect a large number of people. However, seasonal epidemics are not considered pandemics.
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