Table 1 The prevalence distributions of parasites of 507 rural schoolchildren 6–10 years from 12 rural communities of two Mexican states. 1997–2000.

Polyparasitism^b

57 (289)

53–61

Helminth Infection^c

53 (269)

48–57

Protozoan Infection^d

63 (319)

59–67

Pathogenic sp.

   A. lumbricoides

9 (46)

7–11

   T. trichiura

16 (81)

13–19

   G. duodenalis

24 (122)

20–28

   E. histolytica/dispar

5 (25)

3–7

   H. nana

23 (117)

19–27

Non-pathogenic sp.

   E. coli

46 (233)

42–50

   E. nana

38 (193)

34–42