Infection status of An. stephensi at day 8 post infection with P. yoelii. Mosquitoes were infected with P. yoelii only or P. yoelii and the fungal isolate F52 in combination. "Insects held at 26°C" were kept in the insectary throughout the study period whereas "Insects exposed to the gradient" were housed in the same insectary at all times apart from a 30 minute period every day where their thermal preference was determined on the gradient. "Prevalence" indicates the percent of mosquitoes that had a least one oocyst per midgut and "Oocyst burden" indicates the mean (± SEM) number of oocysts found per midgut.