passage

pas·sage (psj)

n.

1. A movement from one place to another.

2. The process of passing from one condition or stage to another.

3. A path, channel, or duct through, over, or along which something may pass.

4. An act of emptying, as of the bowels.

5. The process of passing or maintaining a group of microorganisms or cells through a series of hosts or cultures.

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passage

[pas′ij]

1 an opening, channel, route, or gap.

2 the movement of something from one place to another, as in evacuation of the bowels.

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passage

introduction followed by recovery of an infectious agent in an experimental animal or culture medium.

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blind passage

passage of an infectious agent through an experimental animal or medium without there being any evidence, clinical or cultural, that the agent is present.

serial passage

repeated passage through a series of experimental animals or media, often with the objective of altering the virulence of the agent or adapting it to grow better.