What are parasites and how do they make us sick?

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.comA 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. Protozoa and helminths largely affect the gut, while ectoparasites include lice and mites that can attach to or burrow into the skin, staying there for long periods of time. The majority of protozoa and helminths tend to be non-pathogenic (meaning they don’t cause disease) or result in very mild illness. Some, however, can cause severe disease in humans. Read more: Health check: the low-down on ‘worms’ and how to get

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