The "Crown" actress suffered several long-lasting side effects due to the infection.
Three types of parasites can cause disease in humans. They are protozoa, carried by mosquitos, helminths, such as roundworm, and ectoparasites, for instance lice and bed bugs. Parasites are organisms ...
UNDATED (WKRC) - Scientists say that the most infectious parasite in the world may have infected 50% of people. Toxoplasma gondii is a microscopic parasite that people carry for life if infected.