Table 4.

Snail survey results

	Number of snails	Schistosoma haematobium	Schistosoma bovis	S haematobium–S bovis (hybrid 1)	S haematobium–S bovis (hybrid 2)	S curassoni	S mansoni	Total infected snails (n [median Bayesian posterior prevalence estimate, 95% BCI])
Richard Toll and Lac de Guiers
Bulinus truncatus and Bulinus globosus	2532	60 (2·37%)	15 (0·59%)	25 (0·98%)	6 (0·24%)	0	0	88 (3·71, 2·98–4·55)
Biomphalaria pfeifferi	407	0	0	0	0	0	9 (2·21%)	9 (2·53, 1·25–4·49)
Barkedji and Linguère
Bulinus umbilicatus	4694	6 (0·13%)	0	0	0	15 (0·32%)	0	21 (0·49, 0·31–0·72)

Summary of number (%) of Bulinus and Biomphalaria snails shedding each schistosome genotype over five malacological surveys. BCI=Bayesian credible interval. Hybrid 1 (where the S bovis cox1 mitochondrial DNA profile is associated with the S haematobium nuclear ITS profile) represents miracidia that are the product of repeated backcrossing of hybrids with S haematobium, resulting in biased homogenisation towards this species and ITS sequences that appear as just one species. Hybrid 2 miracidia exhibit either S bovis or S haematobium cox1 profiles associated with both S haematobium and S bovis parental nuclear ITS copies, appearing as double peaks on the four species-specific mutation sites on chromatograms.