Morphological and molecular diagnosis of diseases of free-ranging crab-eating foxes (Cerdocyon thous)

Abstract

The aim of this study was to investigate the occurrence of diseases in free-ranging wild canids that were roadkill on highways in the State of Espírito Santo, Brazil. PCR tests were performed for the detection of Brucella sp., Babesia sp., Rangelia sp., and Hepatozoon sp. in the spleen. Morphological evaluation and identification of parasites was performed in the liver and lung. Twenty specimens of C. thous were necropsied at the Animal Pathology Sector of the Veterinary Hospital of the Universidade Federal do Espírito Santo. Tissue samples were processed for histopathological examination and polymerase chain reaction (PCR) analysis. There was no PCR amplification of genomic DNA sequences of Brucella sp., Babesia sp., Rangelia sp., and Hepatozoon sp. using DNA extracted from the spleen as template. Histologically, lesions associated with parasitism by Platynosomum sp. and Angiostrongylus sp. were observed in the liver and lung, respectively. This is the first report of Platynosomum sp. and Angiostrongylus sp. parasitism in C. thous in the state of Espírito Santo, Brazil. Therefore, this study demonstrated parasitism of crab-eating foxes by Platynosomum sp. and Angiostrongylus sp. Importantly, no evidence of infection with Brucella sp., Babesia sp., Rangelia sp., and Hepatozoon sp. was obtained by PCR analysis.

The Sarcoptic Mange in Maned Wolf (Chrysocyon brachyurus): Mapping an Emerging Disease in the Largest South American Canid

“…With the exception of the records from the states of Minas Gerais (Cbr 33, 38) and Rio de Janeiro (Cbr 42), the recorded cases from the state of São Paulo represent the core zone of the disease circulation. In contrast to maned wolves, records of sarcoptic mange in other wild canids, such as crab-eating foxes and bush dogs, are distributed throughout their range [ 29 , 30 , 36 , 39 , 40 ].…”

“…Sarcoptic mange has been described in crab-eating fox ( Cerdocyon thous ) [ 29 , 30 , 36 ], chilla fox ( Lycalopex griseus ) [ 37 ], sechuran fox ( L . sechurae ) [ 38 ], bush dog ( Speothos venaticus ) [ 39 , 40 ], and maned wolf ( C .…”

“…Sarcoptic mange has been described in crab-eating fox (Cerdocyon thous) [29,30,36], chilla fox (Lycalopex griseus) [37], sechuran fox (L. sechurae) [38], bush dog (Speothos venaticus) [39,40], and maned wolf (C. brachyurus) in Bolivia [41] and Brazil [39]. However, all reports are case descriptions.…”

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“…Platynosomum sp. foi encontrado no fígado de cachorro-do-mato, e as lesões associadas foram hiperplasia ductal, fibrose periductal e hiperplasia periductal (UZAI et al, 2021).…”