Synonym: Babesiella perroncitoi.
Geographic Distribution: Europe (Sardinia), French Sudan.
Morphology: This is a small form. It is usually annular, 0.7 to 2 u in diameter, with a thin ring of cytoplasm surrounding a vacuole, but it may also be oval, quadrangular, lanceolate or piriform, measuring 1.2 to 2.6 by 0.7 to 1.9 u. The trophozoites usually occur singly in the host cells, but sometimes 2 or more may be present.
Life Cycle: The vector is unknown.
Pathogenesis: The disease caused by this species is similar to that caused by B. trautmanni.
Treatment: Acaprin is effective against this species, but trypan blue is presumably not.