Pandemic

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An pandemic is, as defined be the Centers for Disease Control and Prevention (CDC), defined as when an epidemic spreads over several countries or continents, and infects a large number of people.[1]


  1. "Principles of EPIDEMIOLOGY Second Edition". Author CDC. Pub date Dec 1992. Web 29 Oct 2014 http://www.facmed.unam.mx/deptos/salud/bibliotecav/epi_course.pdf