Table 2.
Median survival in days of wild-caught Anopheles albimanus fed on treated and untreated heifers (Belize 2018)
| Pre-treat | Day 2 | Day 5 | Day 7 | Day 14 | |
|---|---|---|---|---|---|
| Untreated heifers (n = 2) | |||||
| Mosquito survival (days) | > 4* (n = 46) | 4 (n = 54) | > 4* (n = 75) | > 4* (n = 48) | > 4* (n = 151) |
| Fipronil-treated heifers (n = 3) | |||||
| Mosquito survival (days) | > 4* (n = 74) | 1 (n = 73) | 1 (n = 115) | 1 (n = 72) | > 4* (n = 213) |
| Statistical significance** | – | χ2 = 96.8; p < 0.0001 | χ2 = 150.7; p < 0.0001 | χ2 = 23.7; p < 0.0001 | χ2 = 19.6; p < 0.0001 |
| Ivermectin-treated heifer (n = 1) | |||||
| Mosquito survival (days) | > 4 (n = 18) | 3 (n = 12) | 4 (n = 23) | 2 (n = 17) | > 4* (n = 82) |
| Statistical significance** | – | χ2 = 4.2; p = 0.04 | χ2 = 27.1; p < 0.0001 | χ2 = 11.7; p = 0.0006 | χ2 = 0.08; p = 0.78 |
* Median mosquito survival exceeded the 4 day observation period; n = total number of engorged mosquitoes
** The χ2 and p-values compare survival curves of the treated groups with that of the corresponding untreated control group, as determined by Logrank tests