Plasmodium falciparum is a unicellular protozoan parasite of humans, and the deadliest species of Plasmodium that cause malaria in humans. The pathogen is transmitted by the bite of a female Anopheles mosquito, and approximately 50% of malaria is caused by Plasmodium falciparum. The disease caused by this pathogen is the most dangerous malaria, also known as falciparum malaria. In 2017, the pathogen caused more than 400,000 deaths and is therefore considered the most deadly parasite. There are also studies that Plasmodium falciparum is closely related to the development of blood cancers, which are classified as Group 2A carcinogen.