Sporozoon are unicellular, parasitic protozoans that cause a range of diseases in animals. There are several synonyms for the word sporozoon, including apicomplexan, sporozoan, and haemosporidian. These terms refer to the same group of microscopic organisms that have complex life cycles and reproduce through the production of sporozoites. In humans, sporozoons cause illnesses such as malaria, toxoplasmosis, and Babesiosis. These diseases can be transmitted to humans through various factors, including mosquito bites, exposure to infected animal feces, or consumption of contaminated food or water. Understanding these synonyms and the diseases caused by sporozoons is essential in preventing their spread and treating those who are infected.