Table 3. Seasonal Biomphalaria pfeifferi snails’ distribution and infection status (n = 623).

Month of the survey	Districts (Villages)	Water bodies	Collected snails	Exposed snails for shedding	Died	Positives	Negatives	Remark
Mid-January	Agallu Metti	Metti River	0	0	0	0	0	No snails
	Chessega	Wau River	0	0	0	0	0	No snails
	Shimala	Jajeba River	0	0	0	0	0	No snails
	Agallu Metti	Sumala stream	0	0	0	0	0	No snails
Mid-March	Agallu Metti	Metti River	0	0	0	0	0	Very small sized few snails were seen
	Chessega	Wau River	0	0	0	0	0
	Shimala	Jajeba River	0	0	0	0	0
	Agallu Metti	Sumala stream	120	105	15 (12.5%)	12 (11.4%)	93 (89.6%)	light cercaria
Mid -May	Agallu Metti	Metti River	213	194	19 (8.9%)	32 (16.5%)	162 (83.5%)	Full of cercaria
	Chessega	Wau River	34	25	9 (26.5%)	2 (8%)	23 (92%)	Full cercaria
	Shimala	Jajeba River	46	40	5 (10.9%)	1 (2.5%)	39 (97.5%)	Full cercaria
	Agallu Metti	Sumala Stream	210	189	21 (10%)	59 (32%)	130 (68%)	Full of cercaria
Total			623	553	70 (11.2%)	106 (19.2%)	447 (80.8%)