Representative figure of lung, brain and heart of TR and TS mice on the late phase (21^st day) of infection with 50 cysts of <i>Toxoplasma gondii</i>.

<p>(A) Lung of TR mice. Little thickening of the alveolar wall (arrows) can be seen, with presence of few lymphoid infiltrates (asterisk). (B) Lung of TS mice. Areas of inflammation, indicated by the presence of granulomas (asterisks), and thickening of alveolar walls (arrows), caused by the migration of mononuclear cells are observed. (C) Brain of TR mice. There are no alterations throughout the tissue. (D) Brain of TS mice. Increased number of lymphoid cells can be seen in the meninges (arrows), suggesting the development of meningitis. (E) Heart of TR mice. Normal tissue structure can be seen. (F) Heart of TS mice. Mildly dense granulomas (asterisks) can be observed in some areas of the heart. Bar = 100 µm.