Salivary gland scores of individual mosquitoes in Experiments 1–5.

After feeding, the mosquitoes were dissected to demonstrate that they had taken a blood meal and establish the salivary gland score (1+ to 3+, see Methods). Nine of the 17 mosquitoes that fed on mice that did not develop parasitemia (negatives) had the highest salivary gland score of 3+. The geometric mean salivary gland scores of the mosquitoes were not significantly different between the two groups (p = 0.2856, Wilcoxon Two Sample Test).