1.6.7 Parasites

Protozoans are single–celled eukaryotes with animal–like behaviors, such as movement and a lack of cell walls. Many of them are pathogens that cause diseases, such as malaria.

Some parasitic worms or helminths are called macroparasites because they can be seen with the naked eye. These worms live and feed inside their living host while adversely impacting them. They can even live in the host for years.

Parasitic worms cause various diseases, for example, helminthiasis and enterobiasis.