<unk>  is a species of parasitic protozoa that causes tertian malaria in humans.  It is closely related to Plasmodium falciparum and Plasmodium vivax, which are responsible for most malaria.  It is rare compared to these two parasites, and substantially less dangerous than P. falciparum.
Plasmodium ovale
Plasmodium knowlesi
Bartonella quintana
Borrelia mayonii
Borrelia afzelii
Borrelia recurrentis
Brugia malayi
Toxoplasma gondii