Skip to main content

Table 2 Median survival in days of wild-caught Anopheles albimanus fed on treated and untreated heifers (Belize 2018)

From: Fipronil and ivermectin treatment of cattle reduced the survival and ovarian development of field-collected Anopheles albimanus in a pilot trial conducted in northern Belize

  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
  1. * Median mosquito survival exceeded the 4 day observation period; n = total number of engorged mosquitoes
  2. ** 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