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date: 25 May 2024


A Dictionary of Epidemiology

Miquel Porta

An epidemic occurring over a very wide area, crossing international boundaries, and usually affecting a large number of people. Only some pandemics cause severe disease in some individuals or at a population level. Characteristics of an infectious agent influencing the causation of a pandemic include: the agent must be able to infect humans, to cause disease in humans, and to spread easily from human to human.... ...

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