Identification of the helminth diversity in died carnivores by Motor Vehicle-Collision in roads of São Paulo, Brazil.

Júlia Ferraz Cereda Martinez, Juliana Marigo, Pedro Enrique Navas Suárez, José Luiz Catão Dias, Priscila Rodrigues de Sousa, Mauricio Candido da Silva

Wildlife mortality by Motor Vehicle-Collision (MVC) is one of the main impacts of roads. In Brazil data suggest a loss of more than 470 million animals per year, approximately 15 per second, impacting most all terrestrial vertebrate species. Roadkills can provide biological and/or epidemiological information. In a local/regional context, it can provide knowledge about parasitological diversity in certain species. The aim of this study was to determine and identify the helminth diversity and its associated injuries in died carnivores by MVC in selected roads of Sao Paulo State, Brazil, between 2017-2019. In the first 25 months, 37 carnivores were recorded. We have representativeness of all families presented in the Atlantic forest. The distribution by sex was: male (n=25) and female (n=12). Body condition was categorized as: good (n=32), and regular (n=5). During necropsy helminths were observed in 57% (n=21) of the cases. Helminths were identified in alimentary tract (n=21), urinary system (n=3) and integumentary system (n=1). According to phylum were observed: Nematodes (18/21; 85.7%), Cestodes (4/21; 19%), and Acanthocephala (7/21; 33.3%). Macroscopically, stomach granulomas were identified in cougar (n=4), which was identified by histopathology as a spiruroid nematode. Hydronephrosis by Dioctophyma sp. was observed in manned wolf (n=2) and greater grison (n=1); there was also a subcutaneous helminthic infection in a cougar (n=1) identified by histopathology as a nematode. Histologically, lungworm was identified in 11 cases, representing 5 species. Molecularly, we already identified one genus of acanthocephala (Oncicola sp.) parasitizing small intestine of cougars (n=2). The next steps are to identify molecularly the other helminths collected. The present data support the idea that roadkills are a good sample to evaluate the helminth diversity in wild carnivores.

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