Table 1 .

Schistosoma mansoni sample characteristics, Brazil

Sample no.	Name	Source description	Parasite count (stage)	No. infected persons (%)
1	Dique do Cabrito	Snails from small neighborhood lake	1,178* (cercariae)	10 (22.0)
2	Itacaranhas	Snails from drainage ditch/sewer	76 (cercariae)	17 (23.0)
3	Rio do Cobre	Snails from shore of river outside São Bartolomeu Reserve	14,800 (cercariae)	20 (30.0)
4	Cachoeira	Snails from base of São Bartolomeu waterfall	Cercariae*	12 (14.5)
5	Pituaçú	Snails from temporary water collections from a municipal park	2,000 (cercariae)	34 (56.6)
6	Av. Vasco da Gama	Snails from median strip drainage ditch/sewer	(cercariae)†	4 (27.3)
7	Lagoa do Urubú	Snails from small neighborhood lake	2,800 (cercariae)	4 (40.0)
8	São Bartolomeu	Infected children from São Bartolomeu neighborhood (2004)	(eggs)†	8 (30.2)
9	MA1	Infected persons from São Bartolomeu neighborhood microarea 1 (2011)	127,728 (eggs)	12 (22.8)
10	MA3	Infected persons from São Bartolomeu neighborhood microarea 3 (2011)	30,616 (eggs)	12 (23.1)
11	MA6	Infected persons from São Bartolomeu neighborhood microarea 6 (2011)	153,273 (eggs)	12 (55.6)
12	Feira de Santana	Oswaldo Cruz Bahia laboratory strain	29,600 (cercariae)	–
13	CWRU	Case Western Reserve University laboratory strain	≈200 (adult worms)	–

^*Estimated cercarial count by a quantitative polymerase chain reaction.

^†Samples no longer available for counting.