 Parasites join two other types of organisms called viruses and bacteria. These other two organisms can live on the surfaces of the foods we eat as well as countertops and other surfaces we touch. These surfaces don't have to be alive. But a parasite can only live on a host which is alive.
 The Crypto parasite looks like the one on the left. It almost looks like a bug. It is also called a germ and sometimes a microorganism. Microorganisms are so small they can't be seen except through a powerful microscope. The crypto parasite you see here has been magnified over 100x so it can be seen.
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Parasites are microscopic organisms which lives in or on a host. A host can be either a human being or another animal, but it must be alive. A parasite obtains its nourishment (food) from the host without the host even knowing the parasite is there until they become sick.
