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An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host. If an obligate parasite cannot obtain a host it will fail to reproduce.
They are obligate intracellular parasites. Before a virus has entered a host cell, it is called a virion, a package of viral genetic material. Virions can be passed from host to host through direct contact or through a vector (an animal carrier who is not affected by the virus--often insects).Inside the organism, the virus can enter the cell in various ways.hey are obligate intracellular parasites. Before a virus has entered a host cell, it is called a virion, a package of viral genetic material. Virions can be passed from host to host through direct contact or through a vector (an animal carrier who is not affected by the virus--often insects).