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Diseases of Aquatic Organisms

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DAO 145:139-144 (2021)  -  DOI:

Visceral mycobacteriosis in amphibians from the Brazilian Caatinga region

Drausio Honorio Morais1,*, Marianna Vaz Rodrigues2, Robson Waldemar Ávila3, Reinaldo José da Silva2

1Instituto de Ciências Agrárias, Universidade Federal de Uberlândia (UFU), Monte Carmelo, Minas Gerais, CEP 38500-000, Brazil
2Departamento de Parasitologia, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, São Paulo, CEP 18618-970, Brazil
3Centro Regional de Ophiologia, Universidade Federal do Ceará (UFC), Fortaleza, Ceará, CEP 60455-760, Brazil
*Corresponding author:

ABSTRACT: Emerging infectious diseases in wild animals related to humans have received greater attention in recent years. Mycobacteriosis is a bacterial disease of animal and human importance. Mycobacterium gordonae infects the skin and internal organs of free-ranging amphibians and is considered the least pathogenic member of the Mycobacteriaceae to humans. However, information about its infection and pathogenesis in wild amphibians is still lacking. A total of 1306 amphibian specimens belonging to 6 families, 12 genera, and 21 species were collected and dissected during a helminthological survey of 7 municipalities in southern Ceará state, Caatinga (eco)region, northeast Brazil. Of these, 17 specimens (0.76%), belonging to 2 families and 4 species (Leptodactylus macrosternum, n = 2; L. vastus, n = 10; Pseudopaludicola pocoto, n = 2; Rhinella jimi, n = 3), presented infections that consisted of calcification nodules in the coelomic cavity, kidney, liver, lung, gut, and pancreas. The nodules were examined by histopathology and PCR. The bacteria were identified as M. gordonae by molecular analyses. Infected animals presented with hepatocellular vacuolar degeneration, karyolysis, and karyorrhexis, hepatic portal congestion, hemorrhage, mononuclear cellular infiltration, melanomacrophage center hyperplasia, and granulomas in varying stages of development with intralesional acid-fast bacilli. This study is the first report of M. gordonae in these amphibian species, in which results of molecular analyses confirmed the presence of M. gordonae in natural environments and histopathology confirmed the typical lesion of mycobacteriosis in amphibians from northeastern Brazil.

KEY WORDS: Mycobacteria · Mycobacterium gordonae · Amphibian diseases · Molecular diagnosis · Histopathology · Pathogenic · Wild animals · Conservation

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Cite this article as: Morais DH, Rodrigues MV, Ávila RW, da Silva RJ (2021) Visceral mycobacteriosis in amphibians from the Brazilian Caatinga region. Dis Aquat Org 145:139-144.

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