Table 2.
Physicochemical parameters of water samples
| Water sources | Isolation of Burkholderia pseudomallei | P* | |
|---|---|---|---|
| Negative median (range) | Positive median (range) | ||
| Rivers | N = 75 | N = 25 | |
| pH | 8.47 (7.55–9.03) | 7.8 (7.49–8.86) | < 0.001 |
| Temperature (°C) | 30.7 (28.3–33.5) | 29.9 (28.5–31.6) | 0.006 |
| Turbidity† (NTU) | 237 (39.6–> 400) | 280 (101.65–> 400) | 0.12 |
| Rice fields | N = 23 | N = 14 | |
| pH | 6.54 (5.11–9.74) | 6.17 (5.23–6.79) | 0.1 |
| Temperature (°C) | 35.1 (31.1–40.8) | 35.2 (31.8–39.5) | 0.9 |
| Turbidity (NTU) | > 400 (22.15–> 400) | > 400 (301–> 400) | 0.6 |
| Lakes and ponds | N = 24 | N = 1 | |
| pH | 7.19 (6.2–8.8) | 6.59 | 0.3 |
| Temperature (°C) | 31.3 (29.4–39.6) | 33.4 | 0.4 |
| Turbidity (NTU) | > 400 (59.75–> 400) | > 400 | 0.5 |
| Water tanks and boreholes | N = 37 | N = 1 | |
| pH | 8.43 (5.81–9.35) | 5.19 | 0.09 |
| Temperature (°C) | 28.8 (26.6–35.6) | 35.75 | 0.09 |
| Turbidity (NTU) | 5.25 (1.65–> 400) | > 400 | 0.1 |
*
Mann-Whitney rank sum test.
†
Limits of turbidimetry: 0.1 to 400 nephelometric turbidity units (NTU).