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Parasitic Disease Center

Parasitic diseases occur when an organism invades a person's body and finds nourishment inside the host. Parasites range from tiny, single-celled organisms (protozoa, which may cause conditions such as babesiosis) to multicellular worms (helminths, including tapeworms and roundworms) that may be visible. The parasitic infection toxoplasmosis can be contracted in numerous ways.

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How Safe Are Plastic Bottles?

TODAY Medical editor Dr. Nancy Snyderman answers viewer e-mails about which kinds of bottles are safe to drink from -- and which aren't.

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Melissa Woychehowsky talks about living with this condition and how she is handling it.

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Dr. Madelyn Fernstrom

Find out what our expert has to say about colds, flu, infections and other health issues in Health Journal, with Dr. Fernstrom.

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