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date: 04 March 2021

Cyclicity, Secular 

A Dictionary of Epidemiology

Miquel Porta

Fluctuation in disease incidence over a period longer than a year. For instance, in large, unimmunized populations, measles tends to have a 2-year cycle of high and low incidence. Empirical observations of secular and seasonal cycles of infectious diseases were the basis for epidemic theory (e.g., the ... ...

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