Answer to Question #185008 in Microbiology for keiandra

Question #185008

Draw the vegetative stage of a protozoa, fluke, round worm and malarial parasite. With organism, magnification and source

Expert's answer

 Life cycles of parasites can be further divided into two categories:

direct (monoxenous) and indirect (heteroxenous).

Parasites with direct life cycles spend most of their adult lives in one host, known as the parasitic stage, with their progeny transmitted from one host to another, known as the free-living stage. Direct parasites often lack an intermediate stage and must leave their host. To do this, they must be able to survive in an environment outside their original host and then locate and establish a new host.

Liver fluke disease (fasciolosis) is caused by the trematode parasite Fasciola hepatica. The disease can result from the migration of large numbers of immature flukes through the liver, or from the presence of adult flukes in the bile ducts, or both. Liver fluke can infect all grazing animals (and man) but mainly affects sheep and cattle. It is most pathogenic in sheep.

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