Table 1.

Monthly distribution of snails associated with human or non-human schistosomiasis

Month	Human schistosomiasis				Non-human schistosomiasis						Total	%
	Bt	Bp	Sum	%	Cb	Mt	Pa	Po	Sum	%
May	597	1,097	1,694	18.2	732	273	324	139	1,468	17.8	3,162	18.0
June	294	1,090	1,384	14.9	598	296	213	148	1,255	15.3	2,639	15.1
July	201	486	687	7.4	458	151	139	110	858	10.4	1,545	8.8
August	0	0	0	0	0	0	0	0	0	0	0	0.0
September	0	0	0	0	0	0	0	0	0	0	0	0.0
October	0	0	0	0	0	0	0	0	0	0	0	0.0
November	99	109	208	2.2	63	0	19	0	82	1	290	1.7
December	191	242	433	4.7	155	26	65	27	273	3.3	706	4.0
January	303	352	655	7	300	40	186	58	584	7.1	1,239	7.1
February	475	521	996	10.7	490	187	255	134	1,066	13	2,062	11.8
March	738	657	1,395	15	705	149	272	149	1,275	15.5	2,670	15.2
April	995	854	1,849	19.9	765	138	335	127	1,365	16.6	3,214	18.3
Total	3,893	5,408	9,301	100	4,266	1,260	1,808	892	8,226	100	17,527	100.0
%	42	58	53		52	15	22	11	47		100

Bt, Bulinus truncates; Bp, Biomphalaria pferifferi; Cb, Cleopatra bulimoides; Mt, Melanoides tuberculatus; Pa, Physa acuta; Po, Pila ovata.