obligate parasite

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Related to obligate parasite: accidental parasite


1. a plant or animal that lives upon or within another living organism at whose expense it obtains some advantage; see also symbiosis. Parasites include multicelled and single-celled animals, fungi, and bacteria, and some authorities also include viruses.Those that feed upon human hosts can cause diseases ranging from the mildly annoying to the severe or even fatal. (See accompanying table.)
Types of parasites.
adj., adj parasit´ic.
accidental parasite one that parasitizes an organism other than the usual host.
facultative parasite one that may be parasitic upon another organism but can exist independently.
incidental parasite accidental parasite.
malarial parasite Plasmodium.
obligate parasite (obligatory parasite) one that is entirely dependent upon a host for its survival.
periodic parasite one that parasitizes a host for short periods.
temporary parasite one that lives free of its host during part of its life cycle.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ob·li·gate par·a·site

a parasite that cannot lead an independent nonparasitic existence, in contrast to facultative parasite.
Farlex Partner Medical Dictionary © Farlex 2012

ob·li·gate pa·ra·site

(ob'li-găt par'ă-sīt)
A parasite that cannot lead an independent nonparasitic existence, in contrast to facultative parasite.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The last three species are obligate parasites. They evolve on living trees well, where they form one-year fruit bodies, which bear spores within the limited time.
Viruses are obligate parasites of living cells, he says; every living organism in the biosphere suffers viral parasitism, and its genome bears the indelible imprint of virus infection.
Eggs usually hatch at the end of autumn, and new mites, which at their larval stage are obligate parasites of warm-blooded hosts, usually feed and grow on the skin of small rodents and dogs, injecting lytic enzymes to digest cutaneous cells.
Babesiosis or Equine Piroplasmosis is one of the protozoan diseases which causes serious problems for horse husbandry and impairs the equine industry considerably [1].Equine babesiosis is caused by Babesia equi (Theileria equi) and Babesia caballi, which are intracellular obligate parasites of the phylum Apicomplexa and cause hemoparasitic disease in horses [2,3].
Many species of Calliphoridae are saprophages that feed on animal carcasses, whereas others are obligate parasites. (2) S.
Some plant parasites are obligate parasites, that is, organisms that must obtain nutrition for survival from living host tissue.