Costa-Silva S, Sacristan C, Gonzales-Viera O, Diaz-Delgado J, Sanchez-Sarmiento AM, Marigo J, Groch KR, Carvalho VL, Ewbank AC, Colosio AC, Marcondes MCC, de Meirelles ACO, Bertozzi CP, Lailson-Brito JJr, Azevedo AF, Ruoppolo V, Oliveira L, Ott PH, Catao-Dias JL. (2019). Toxoplasma gondii in cetaceans of Brazil: a histopathological and immunohistochemical survey. Brazilian Journal of Veterinary Parasitology. Brazilian Journal of Veterinary Parasitology. 

In this manuscript we investigated the occurrence of T. gondii by histopathology and immunohistochemistry in tissue samples of 185 animals comprising 20 different cetacean species from Brazil. Three out of 185 (1.6%) animals presented T. gondii-associated lesions: a captive killer whale Orcinus orca, a free-ranging common bottlenose dolphin Tursiops truncatus and a free-ranging Guiana dolphin Sotalia guianensis. The main lesions observed in these animals were necrotizing hepatitis, adrenalitis and lymphadenitis associated with protozoal cysts or extracellular tachyzoites presenting immunolabeling with anti-T. gondii antibodies. This study widens the spectrum of species and the geographic range of this agent in Brazil, and provides the first reports of T. gondii infection in a captive killer whale and in a free-ranging common bottlenose dolphin in South America.  

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