| obligate parasite | A parasite that cannot lead an independent nonparasitic existence, in contrast to facultative parasite. (05 Mar 2000) |
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| temporary parasite | An organism accidentally ingested that survives briefly in the intestine. (05 Mar 2000) |
| tertian parasite | A protozoan parasite that causes vivax malaria (malaria, vivax). This species is found almost everywhere malaria is endemic and is the only one that has a range extending into the temperate regions. (12 Dec 1998) |
| euroxenous parasite | A parasite with a broad or non-specific host range. (05 Mar 2000) |
| facultative parasite | An organism that may either lead an independent existence or live as a parasite, in contrast to obligate parasite. (05 Mar 2000) |