Scatter plots showing the presence of T and B lymphocytes in the nervous tissue of the dogs. a: CD3+ T lymphocytes. b: CD79α + B lymphocytes. Data are expressed as the percentage of immunostained area in relation to the total area, analysed colorimetrically by the software Image Pro-Plus 6.1. Horizontal lines indicate median (estimator of position measure) and the interquartile range (estimator of dispersion measure). LTN: dogs with seropositivity to visceral leishmaniasis, toxoplasmosis and neosporosis. L: dogs with seropositivity only for visceral leishmaniasis. TN: dogs with seropositive diagnosis only for toxoplasmosis and/or neosporosis. C: control healthy dogs. (* indicates P < 0.05).