- For a microorganism to enter, invade, or inhabit another organism, causing infection or contamination.
- To dwell internally, endoparasitically, as opposed to externally (infest).
[L. in-ficio, pp. -fectus, to dip into, dye, corrupt, infect, fr. in + facio, to make]
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Examples: glitazone, GI cocktail, etc.