Table 2.
V. cholerae non-O1/non-O139, fecal coliforms, and total dissolved solids by well type
| Parameter | V. cholerae non-O1 (total isolations) | Fecal coliforms (CFU/100 mL) | Total dissolved solids (ppm) | |||
|---|---|---|---|---|---|---|
| n | Count (%) | Average (SD) | Percent (positive) | n | Average (SD) | |
| All types | ||||||
| Improved | 263 | 2 (0.76) | 18.7 (63) | 24.6 | 261 | 260 (96) |
| Unimproved | 82 | 4 (4.87) | 169 (134) | 80.9 | 52 | 298 (152) |
| Improved | ||||||
| Mark II | 186 | 1 (0.53) | 15.1 (59) | 18.8 | 186 | 274 (99) |
| Gravity | 53 | 1 (1.88) | 1.6 (4.9) | 18.8 | 52 | 208 (60) |
| Other pump | 24 | 1 (4.16) | 76.5 (108) | 75 | 23 | 305 (92) |
| Unimproved | ||||||
| Spring water | 43 | 1 (2.35) | 55.2 (91) | 53.4 | 41 | 220 (78) |
| Dug by hand | 39 | 2 (5.12) | 208 (131) | 79.4 | 37 | 327 (168) |
| Total | 345 | 6 (1.74) | 47.4 (100) | 37.3 | 339 | 266 (108) |