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Macroscopic characteristics of a mouse infected with 10 000 trypomastigotes of Querétaro strain ((a), (c)) and a control mouse ((b), (d)). The Querétaro strain infection provokes back bristling hair and loss of mobility of their posterior extremities ((a); arrow). After sacrifice and removal of the skin, the skeletal muscle of mouse infected with Querétaro strain showed pale areas on the tissue ((c); arrowheads).
