Table 1. Number of positive samples for Giardia lamblia in each method of giardiasis diagnosis and the intensity of the color reaction in the enzyme-linked immunosorbent assay (ELISA) method in 142 fecal samples.
| ELISA Number of samples/reaction intensity | Positive microscopy: number of samples | Negative microscopy: number of samples |
|---|---|---|
| 130 negatives | 2 | 128 |
| 2 positives (+) | 0 | 2 |
| 3 positives (++) | 1 | 2 |
| 5 positives (+++) | 3 | 2 |
| 2 positives (++++) | 1 | 1 |
| Total | 7 | 135 |
Chi-squared test for trend: p < 0.0001.