A parasitic disease is an infectious disease caused or transmitted by a parasite. Many parasites do not cause diseases. Parasitic diseases can affect practically all living organisms, including plants and mammals. The study of parasitic diseases is called parasitology.
Some parasites like Toxoplasma gondii and Malaria can cause disease directly, but other organisms can cause disease by the toxins that they produce.
Read more about Parasitic Disease: Terminology, Causes, Symptoms, Effects, Treatment
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