Lippincott, Williams & Wilkins, Epidemiology, 1(21), p. 152-153, 2010
DOI: 10.1097/ede.0b013e3181c1e92a
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While the Latin phrase in vitro and in vivo are well understood in the medical literature, neither term accurately describes the science performed at the level of the population by epidemiologists and others. In particular, results in a single organism can differ broadly from results in a population, for reasons from random error to herd immunity. We suggest that in populo, meaning literally “in the people”, can fill this gap in the literature, and urge its wide adoption.