A Parasite is an organism that lives on or in a host organism and obtains its food source from or at the expense of the host. There are three main classes of Parasites that can cause disease in humans.

These are known as Protozoa, Helminths and Ectoparasites.

Protozoa are microscopic organisms that multiply in humans which can cause serious infections. Transmission from one host to another can be via the fecal-oral route usually by contaminated food or water. Mosquitoes and sand flys can be another transmission route.

Helminths are large multicellular organisms which can be visible to the naked eye in its adult stages. These are able to multiple in human hosts. Flatworms ( Flukes and Tapeworms )

Thorney Headed Worms reside in gastro intestinal tracts.

Round worms can reside in gastro intestinal tracts, blood, lymphatic systems and subcutaneous tissue. The larvae can cause disease through various parts of the body to include the lung, bone and joints, causing muscle pain, numbness, arthritic pains and a rapid heartbeat.
Ectoparasites these are broadly including blood sucking arthropods such as ticks, lice, fleas, mosquitos or mites which can burrow or attach themselves to skin.

These can cause diseases in their own right but can be known as vectors or transmitters, carriers of other diseases such as Lyme Disease.

Parasites

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