Through inoculation with beads, the described technique enables the stimulation of the mosquito melanization response in the hemolymph circulating system. The amount of melanin covering the beads can be measured after dissection as a measure of the immune response.
Barreaux, A. M. G., Barreaux, P., Thomas, M. B., Koella, J. C. Inoculating Anopheles gambiae Mosquitoes with Beads to Induce and Measure the Melanization Immune Response. J. Vis. Exp. (119), e55013, doi:10.3791/55013 (2017).