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Subcutaneous dirofilariasis due to Dirofilaria immitis in a dog in Brazil: first report

The aim of this study was to report on the presence of microfilariae of Dirofilaria immitis causing nodular pyogranulomatous dermatitis in a dog in the state of Rio Grande do Norte, northeastern Brazil. A 4-year-old male dachshund dog with lesions in the nostrils and left dorsolateral regions was tr...

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Detalles Bibliográficos
Autores principales: da Silva, Welitânia Inácia, Gomes, Alexander Rodrigo Dantas, de Francisco, Maria Carolina, da Silva, Janete Madalena, de Oliveira, Hodias Sousa, Feitosa, Thais Ferreira, Vilela, Vinícius Longo Ribeiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Colégio Brasileiro de Parasitologia Veterinária 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10259417/
https://www.ncbi.nlm.nih.gov/pubmed/37283421
http://dx.doi.org/10.1590/S1984-29612023032
Descripción
Sumario:The aim of this study was to report on the presence of microfilariae of Dirofilaria immitis causing nodular pyogranulomatous dermatitis in a dog in the state of Rio Grande do Norte, northeastern Brazil. A 4-year-old male dachshund dog with lesions in the nostrils and left dorsolateral regions was treated. Tests were requested to aid in making the diagnosis, such as skin cytology, Knott's test, thick smear and histopathology of the lesions. From these, presence of a diffuse pyogranulomatous process was observed and, amidst the cellular material, microfilariae of Dirofilaria spp. A conventional polymerase chain reaction test on tissue samples from the lesions revealed the presence of the species D. immitis. Treatment based on ivermectin (3mg) was administered at a single oral dose of 0.6 mg/kg. In the first seven days there was regression of the lesions, but after 30 days there was recurrence. A new treatment was administered, consisting of 10% imidacloprid + 2.5% moxidectin (4-10 mg/kg), with one application per month for 6 months, and doxycycline (100 mg), 10 mg/kg, 1 tablet, 2 times a day, for 30 days. In conclusion, D. immitis microfilariae caused pyogranulomatous lesions in the subcutaneous tissue of a dog. This had not previously been described in Brazil.