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Endemic Diseases

Edexcel A-level BiologyViruses, Fungi and ProtozoaLesson 15 of 17

A disease is endemic when it is always present in a particular population or region, at a fairly constant, expected level. Malaria is endemic in much of sub-Saharan Africa and parts of Asia and South America. Chickenpox is endemic in the UK.

Compare these terms:
• epidemic: a sudden rise in cases well above the expected level in one area or population
• pandemic: an epidemic that spreads across several countries or continents, such as the 2009 H1N1 flu pandemic or COVID-19.

Malaria is endemic where conditions suit both the parasite and the vector:

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