Table 2.

Global distribution and ovum morphology of human Schistosoma spp.

	Geographic distribution	Size	Shape	Spine
S. guineensis and related S. intercalatum	West and Central Africa	140–240 × 50–85 μm	Elongated	Terminal
S. haematobium	Africa, Madagascar and Middle East	110–170 × 40–70 μm	Elongated	Terminal
S. japonicum	China, East Asia and Philippines	55–85 × 40–60 μm	Oval	Small lateral knob
S. mansoni	Africa, Middle East, parts of South America and Caribbean	115–175 × 45–70 μm	Elongated	Lateral
S. mekongi	Southeast Asia, especially Mekong delta	50–65 × 30–55 μm	Oval	Small lateral knob