The Conversation

What are parasites and how do they make us sick?

Author: Vincent Ho, Senior Lecturer and clinical academic gastroenterologist, Western Sydney University

Giardia is an example of a parasite you don't want to catch. Symptoms can include diarrhoea, abdominal cramps, fatigue, weakness and weight loss.From shutterstock.com

A parasite is an organism that lives in or on an organism of another species.

Three main classes of parasites can cause disease in humans: protozoa, helminths, and ectoparasites....

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