A long narrow channel inside the body.
The process of moving from one place to another.
Evacuation of the bowels.
The introduction of an instrument into a cavity.
A channel between cavities and body structures or with the external surface of an organ.
Inoculating a parasite into a host or introducing a saprobe into a substratum, followed by its re-isolation, is a common practice in studying the pathogenicity of microorganisms. This technique involves successive passages that may lead to an alteration of the pathogen’s virulence, or the selection of a new population of bacteria.