occurs in occurs in unfolds_in bearer of has characteristic is bearer of has participant has_participant causally upstream of infection infection acquisition susceptibility contagiousness host organism infection acquisition from infectious host InfectionAcquisitionFromInfectedHost An infection acquisition from an individual who is infectious. The individual acquiring the infection can be of a different species than the one who is infectious. An infection acquisition whereby a susceptible host acquires an infection from an infectious host. William R. Hogan entry into host symbiont entry into host organism