parasite

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Related to obligate parasite: accidental parasite
References in periodicals archive ?
castoris will likely remain an obligate parasite of the beaver.
Such selection would be expected for any obligate parasite that is dispersing among strongly differentiated host populations.
This mite is an obligate parasite which inhabits the vertical and horizontal ear canals of dogs and cats.
Chlamydia-like obligate parasite of free-living amoebae.