TABLE I. Seroprevalence for Trypanosoma cruzi infection in Barcelos, state of Amazonas, Brazil, by indirect immunofluorescence (IIF) from filter paper and serum for Diamed ID-PaGIA agglutination test.
| Seroprevalence (screening testsa) | |||
|---|---|---|---|
| Age group (years) | Tested/positive n (%) | ||
| 1991 (IIF) | 1993 (IIF) | 1997 (ID-PaGIA) | |
| 0-10 | 197 (7.6) | 248 (5.6) | 215 (12.1) |
| 11-20 | 208 (11.7) | 143 (13.3) | 255 (25.4) |
| 21-30 | 91 (14.3 ) | 91 (9.9) | 139 (15.7) |
| 31-40 | 76 (19.7) | 58 (8.6) | 100 (11.3) |
| 41-50 | 58 (12.1) | 42 (7.1) | 69 (7.8) |
| 51-60 | 34 (8.8) | 34 (11.8) | 43 (4.9) |
| > 60 | 46 (22.2) | 42 (24) | 65 (7.4) |
| Total | 710 (12.5 ) | 658 (13.7) | 886 (13.2) |
a : only 2.8-5% confirmed by IIF, ELISA and/or recombinant ELISA and Western blot. Source: Coura et al. (1999).