RESUMENObjetivo: Caracterizar las posibles alteraciones histológicas en el globo ocular de ratones infectados masivamente con Toxocara canis, durante los estadios agudos y crónicos de la infección. Método: Se realizó un estudio experimental, prospectivo in vivo, con globos oculares derechos e izquierdos correspondientes a cinco grupos de cuatro ratones cada uno (dos blancos (A/J) y dos negros (C57/BL) infectados por vía endovenosa con 1.000 huevos embrionados de Toxocara canis. Los ratones fueron sacrificados de forma secuencial post infección (3-180 días), se realizó microscópica convencional e histopatología fotografiadas. Resultados: Todos los ratones mostraron algún grado de daño ocular en uno o ambos ojos. La retina era la capa más afectada con edema, hemorragia y cambios degenerativos severos. Otras alteraciones incluyeron reacción inflamatoria de la córnea, obliteración de la cámara anterior con material fibrinoide, asimismo, se evidenció cambios en la histología normal de la uvea y del cristalino. En dos ojos de ratones se encontraron segmentos de larva en la retina, sin reacción inflamatoria alrededor de ellos. ARTÍCULO ORIGINAL ABSTRACTObjective: To characterize the histologic alterations in the ocular globe of mice infected with eggs of Toxocara canis, during both the acute and chronic stages of the infection. Method: Performance of an experimental, prospective study in vivo, with right and left ocular globes [using 5 groups of 4 mice in each study; 2 white (A/J) and 2 black (C57/BL)], infected by the intravenous injection of 1000 embrionated Toxocara canis eggs. The mice were sacrificed sequentially post infection (3-180 days), the eyes evaluated by conventional microscopic techniques and the histopathology findings recorded. Results: All the mice revealed some degree of ocular damage in one or both eyes. The retina was the most affected layer with edema, hemorrhage and severe degenerative changes seen. Other alterations included inflammation of the cornea, and obliteration of the anterior chamber with fibrinoid material. We also demonstrated changes in the normal histology of the uvea and lens. In only two eyes were segments of larvae found in the retina, and in each instance there was no evidence of an inflammatory reaction around them.
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