# List of Plasmodium species infecting primates

The Plasmodium species infecting primates include the parasites causing malaria in humans.

## Species infecting humans
### Common infections

* Plasmodium falciparum (the cause of malignant tertian malaria)
* Plasmodium vivax (the most frequent cause of benign tertian malaria)
* Plasmodium ovale curtisi (another, less frequent, cause of benign tertian malaria)
* Plasmodium ovale wallikeri (another, less frequent, cause of benign tertian malaria)
* Plasmodium malariae (the cause of benign quartan malaria)
* Plasmodium knowlesi (the cause of severe quotidian malaria in Southeast Asia)

### Rare cases

While infection of humans by other species is known, they are quite rare, in some instances, only a single case. In a number of the cases, the means of infection is unknown, and may be due to accident, i.e. infection by laboratory equipment or a bite by an animal. With the use of the polymerase chain reaction additional species have been and are still being identified that infect humans.
* Plasmodium cynomolgi (spp. cynomolgi, bastianellii)
* Plasmodium inui
* Plasmodium schwetzi
* Plasmodium semiovale
* Plasmodium simium
(Plasmodium brasilianum and Plasmodium rhodiani which have been reported to infect humans, are likely synonymous with P. malariae)
One possible experimental infection has been reported with Plasmodium eylesi. Fever and low grade parasitemia were apparent at 15 days. The volunteer (Dr Bennett) had previously been infected by Plasmodium cynomolgi and the infection was not transferable to a gibbon (P. eylesi 's natural host) so this cannot be regarded as definitive evidence of its ability to infect humans. A second case has been reported that may have been a case of P. eylesi but the author was not certain of the infecting species.
A possible infection with Plasmodium tenue has been reported. This report described a case of malaria in a three-year-old black girl from Georgia, United States, who had never been outside the US. She suffered from both P. falciparum and P. vivax malaria and while forms similar to those described for P. tenue were found in her blood even the author was skeptical about the validity of the diagnosis.
Confusingly Plasmodium tenue was proposed in the same year (1914) for a species found in birds. The human species is now considered to be likely to have been a misdiagnosis and the bird species is described on the Plasmodium tenue page.

### Former names

Taxonomy in parasitology until the advent of DNA based methods has always been a problem and revisions in this area are continuing. A number of synonyms have been given for the species infecting humans that are no longer recognised as valid. Since perusal of the older literature may be confusing some currently defunct species names are listed here.
P. causiasium P. golgi P. immaculatum P. laverani var. tertium P. laverani var. quartum P. malariae var. immaculatum P. malariae var. incolor P. malariae var. irregularis P. malariae var. parva P. malariae var. quartanae P. malariae var. quotidianae P. perniciosum P. pleurodyniae P. praecox P. quartana P. quotidianum P. sedecimanae P. tenue P. undecimanae P. vegesio-tertaniae
Plasmodium shortii and Plasmodium osmaniae are now considered to be junior synonyms of Plasmodium inui.