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Example of an epidemic showing the number of new infections over time. An epidemic (from Greek ἐπί epi "upon or above" and δῆμος demos "people") is the rapid spread of disease to a large number of hosts in a given population within a short period of time.
A medical dictionary definition of pandemic is "an epidemic occurring on a scale that crosses international boundaries, usually affecting people on a worldwide scale". [14] A disease or condition is not a pandemic merely because it is widespread or kills many people; it must also be infectious.
For a given epidemic or pandemic, the average of its estimated death toll range is used for ranking. If the death toll averages of two or more epidemics or pandemics are equal, then the smaller the range, the higher the rank. For the historical records of major changes in the world population, see world population. [3]
'We are a bit vulnerable right now if something spread very quickly, like a flu, that was quite fatal.' Bill Gates warns world 'vulnerable' to deadly epidemic in next decade Skip to main content
Snow used chlorine in an attempt to clean the water and removed the handle; this ended the outbreak. This has been perceived as a major event in the history of public health and regarded as the founding event of the science of epidemiology, having helped shape public health policies around the world.
Difference between outbreak, endemic, epidemic and pandemic. In epidemiology, an outbreak is a sudden increase in occurrences of a disease when cases are in excess of normal expectancy for the location or season. It may affect a small and localized group or impact upon thousands of people across an entire continent.
The 735–737 Japanese smallpox epidemic (天平の疫病大流行, Tenpyō no ekibyō dairyūkō, "Epidemic of the Tenpyō era") was a major smallpox epidemic that afflicted much of Japan. Killing approximately one third (around 1 million individuals) of the entire Japanese population, the epidemic had significant social, economic, and ...
The virus outbreak originated in Wuhan, China. [38] It was first detected in December 2019, which is why scientists called it COVID-19 (coronavirus disease 2019). [39] This outbreak has since caused a health issue in the city of Wuhan, China which evolved into a global pandemic. The World Health Organization officially declared it a pandemic on ...