On this video we will talk about the worst pandemics the world has ever seen, from ancient times all the way up to the Spanish Flu.
At the beginning, credit:
"Indeed political battles, military campains and economic vicissitudes pale in importance when measured against the impact of even a single....epidemic. S.E.D. Short
Epidemic: a sudden outbreak of infectious disease that spreads rapidly through the population, affecting a large proportion of people. The commonest epidemics today are of influenza.
Pandemic: An epidemic that spreads through human populations over a very wide area, crossing international boundaries and usually affecting a large number of people.
The discovery of disease-causing pathogens is a very important aspect of the work of medical science. Many viruses, bacteria, protozoa, fungi, helminthes and prions have been identified as a confirmed or potential pathogen. United States started a Center for Disease Control program in 1995, identifing over a hundred patients with life-threatening illnesses that were considered to be of an infectious cause, but that could not be linked to a known pathogen. The association of pathogens with disease it is a complex and difficult process, that in some cases can require decades or even centuries to achieve.
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