Table 2. Ecological zones suitability and distribution of Anopheles species.

Ecological zone	Estimated Area (km2)	Mean Distribution Density per sq. km			Prevalence (%)
		An. gambiae s.l.	An. gambiae s.s.	An. arabiensis	An. gambiae s.l.	An. gambiae s.s.	An. arabiensis
Sahel savanna	80,277.79	1.19	1.15	1.12	59.38	57.71	56.12
Sudan savanna	152,500.02	1.34	1.18	1.16	67.21	58.96	58.08
Northern Guinea savanna	91,944.45	1.24	1.20	1.17	61.96	60.22	58.57
Southern Guinea savanna	109,444.46	1.20	1.24	1.20	60.06	61.88	59.82
Mid Altitude	25,000.00	1.17	1.18	1.16	58.45	59.02	57.90
Derived savanna	204,166.69	1.30	1.39	1.36	65.18	69.26	68.24
Humid forest	85,277.79	1.43	1.35	1.36	71.47	67.59	67.79

Note: distribution density = 1km^-2 is equivalent to prevalence = 50% (unsuitable zone and species absence, designated with a green square); >1km^-2 ≡ >50% (suitable zone and species presence); and 2km^-2 ≡ 100% (highly suitable zone with maximum prevalence of species, designated with a red square).