Total numbers of splenic cells (a), CD4+ T cells (b) and CD4+ T cells producing cytokines, IFN-γ, IL-2, IL-4 and IL-10 (c-f respectively) in mice infected with P. chabaudi (ER) on day 13 after infection. Mice were submitted to bites by infected mosquitoes (infect), previous bites by uninfected mosquitoes before infected mosquitoes (uninfect. + infect.), only bites by uninfected mosquitoes (uninfect.) and not bitten (naive). The values represent the means and standard errors of the means of 3 mice.