<P> In biology and medicine, a host is an organism that harbours a parasitic, a mutualistic, or a commensalist guest (symbiont), the guest typically being provided with nourishment and shelter . Examples include animals playing host to parasitic worms (e.g. nematodes), cells harbouring pathogenic (disease - causing) viruses, a bean plant hosting mutualistic (helpful) nitrogen - fixing bacteria . More specifically in botany, a host plant supplies food resources to micropredators, which have an evolutionarily stable relationship with their hosts similar to ectoparasitism . The host range is the collection of hosts that an organism can use as a partner . </P> <P> Symbiosis spans a wide variety of possible relationships between organisms, differing in their permanence and their effects on the two parties . If one of the partners in an association is much larger than the other, it is generally known as the host . In parasitism, the parasite benefits at the host's expense . In commensalism, the two live together without harming each other, while in mutualism, both parties benefit . </P>

Is a virus a host or a parasite
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