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Related to obligate parasite: accidental parasite
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castoris will likely remain an obligate parasite of the beaver.
Viruses are obligate parasites. They require a viable host cell for growth and do not replicate on foods; viruses do not technically "live." By contrast, bacteria generally require some time, a favorable temperature climate, and an appropriate growth medium before amplification adequate for infection can occur.
Chlamydia-like obligate parasite of free-living amoebae.
Obligate parasite A parasite that requires certain hosts to develop and cannot live apart from their host.
The bacterium is an obligate parasite. This means it must have the soybean cyst nematode to complete its life cycle.