In populo.
While the Latin phrases 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, the effect of an exposure in a single organism can differ from those in a population, for reasons ranging from random error to herd immunity. We suggest that in populo (meaning literally "in the people") can fill this gap in the literature.
Westreich
Daniel
D
Department of Epidemiology, UNC Gillings School of Global Public Health, Chapel Hill, NC, USA. westreic@email.unc.edu
Pence
Brian W
BW
Turner
Abigail Norris
AN
D004813:Epidemiology; D006801:Humans; D009626:Terminology as Topic