haigustekitaja keskkonda sisenemise bioloogiliste radade kindlakstegemine ja sisenemise tõenäosuse kvalitatiivne või kvantitatiivne hindamine, process of describing the biological pathway(s) necessary for an importation activity to "release" (that is introduce) pathogenic agent into a particular environment, and estimating the probability, either qualitatively or quantitatively, of that complete process occuring)