Table 1.

Study population.

Group	Infection status	Description	Age (mean ± SD)	Sex (M/F)
Infected (I) n = 7	Infected with S. mansoni	Individuals living in an endemic area for schistomiasis with stool positive examinations	17.1 ± 14.9	5/2
Suseptible to reinfection (SR) n = 9	Infected with S. mansoni	Individuals living in a endemic area for schistosomiasis that present stool positive examination after praziquantel treatment	22.8 ± 12.1	3/6
Resistant to reinfection (RR) n = 9	Not infected	Individuals living in a endemic area for schistosomiasis that although water contact, present stool negative examination after praziquantel treatment	18.8 ± 9.3	5/4
Naturally resistant (NR) n = 9	Not infected	Individuals living in a endemic area for schistosomiasis that although water contact, present stool negative examination	45.8 ± 8.1	5/4
Not infected (NI) n = 8	Not infected	Individuals living out of endemic area for schistosomiasis that never present this disease in their lives	28.3 ± 4.5	3/5