Smallpox was an infectious disease caused by either of two virus variants, Variola major and Variola minor. The disease is also known by the Latin names variola or variola vera, derived from varius ("spotted") or varus ("pimple"). The disease was originally known in English as the "pox" or "red plague".
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- During the 1960s and early 1970s health workers applied epidemiologic methods to eradicate smallpox worldwide. This was an achievement of unprecedented proportions for applied epidemiology.
- Randy M. Page; Galen E. Cole; Thomas C. Timmreck (1 January 1995). Basic Epidemiological Methods and Biostatistics: A Practical Guidebook. Jones & Bartlett Learning. p. 14. ISBN 978-0-86720-869-6.