Table 4. Water container surveys in Tri Nguyen - prevalence of Ae. aegypti immatures and abiotic water parameters in water storage containers in northern, central and southern areas in June 2016.
| Area | # Houses
surveyed |
Container
type |
Mean
cont. per house |
Number
cont. surveyed |
Number
cont. +ve Ae. aegypti |
% cont.
+ve Ae. aegypti |
Water parameters | ||
|---|---|---|---|---|---|---|---|---|---|
| pH | Salinity
(ppt) |
Conductivity | |||||||
| North | 24 | Tanks | 2.4 | 58 | 6 | 10.3 | 7.93 | 0 | 178 |
| Drums | 1.2 | 28 | 11 | 39.3 | 7.56 | 0 | 348 | ||
| Jars | 1.0 | 24 | 6 | 25.0 | 7.48 | 1.1 | 513 | ||
| Buckets | 1.1 | 26 | 7 | 26.9 | 7.16 | 0.1 | 521 | ||
| Vases | 0.6 | 14 | 0 | 0 | 5.87 | 0 | 389 | ||
| Other | 0.1 | 2 | 0 | 0 | 7.38 | 0 | 733 | ||
| Subtotal | 6.3 | 152 | 30 | 19.7 | 7.46 | 0.0 | 348 | ||
| Center | 13 | Tanks | 2.6 | 34 | 3 | 8.8 | 8.20 | 1.1 | 2056 |
| Drums | 2.6 | 34 | 11 | 32.4 | 7.84 | 1.6 | 2783 | ||
| Jars | 0.8 | 10 | 6 | 60.0 | 7.77 | 1.2 | 2418 | ||
| Buckets | 2.2 | 28 | 4 | 14.3 | 7.99 | 1.7 | 2928 | ||
| Vases | 0.2 | 3 | 0 | 0.0 | 5.87 | 0 | 255 | ||
| Other | 0.6 | 8 | 1 | 12.5 | 7.92 | 1.6 | 849 | ||
| Subtotal | 9.0 | 117 | 25 | 21.4 | 7.93 | 1.4 | 2515 | ||
| South | 13 | Tanks | 1.2 | 16 | 2 | 12.5 | 8.06 | 2.5 | 4150 |
| Drums | 2.5 | 33 | 9 | 27.3 | 7.99 | 1.7 | 2966 | ||
| Jars | 0.8 | 10 | 4 | 40.0 | 8.29 | 2.4 | 4130 | ||
| Buckets | 1.7 | 22 | 5 | 22.7 | 7.90 | 2.3 | 4050 | ||
| Vases | 0.4 | 5 | 0 | 0 | 7.04 | 1.0 | 1713 | ||
| Other | 0.2 | 2 | 0 | 0 | 8.15 | 1.7 | 2887 | ||
| Subtotal | 6.8 | 88 | 20 | 20 | 7.96 | 2.0 | 3512 | ||