A 35-year-old Indian man who couldn't urinate learned his problem was being caused by a horrifying worm that can grow up to a metre in length inside the human body. Disturbing images published by ...

There are two types of human intestinal parasites, protozoa – single-celled organisms that can multiply inside the human body – and helminths, organisms such as tapeworms, roundworms and ...

So far, no preventative vaccination against malaria exists, and its control depends heavily upon antimalarial drugs that kill parasites inside the human body. Malaria has been noted for more than ...