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Coronavirus 2019 (COVID-19) Variants

Coronavirus-2019 (COVID-19)

Coronavirus 2019 (COVID-19) disease is the clinical illness caused by the novel coronavirus that was initially called severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2; SARS-2).
SARS-CoV-1 (SARS-1), a different strain of coronavirus, caused illness during 2002-2004. It also caused severe respiratory disease, then essentially eradicated.

It is important to define the terms used to describe the extent of viral infections, although there is considerable overlap, and the terms often are used interchangeably. An outbreak  is a sudden increase in the incidence of disease in a defined location. It can progress to an epidemic  if it affects a large number of people within a community, population, or region. A pandemic  is an epidemic that is spread over multiple countries or continents.  Endemic defines a disease that remains in a particular country or region with periodic outbreaks. The best example is influenza, which has been endemic in the United States for centuries.

 

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