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de Pinho FA, Mendes MO, de Magalhães VLP, Tinôco AAC, Seoane JHL, Rêgo FD, Soares RP, Barrouin-Melo SM. Clinical evolution of equine leishmaniasis with self-limiting cutaneous disease caused by Leishmania infantum in northeastern Brazil: A case report. Vet Parasitol Reg Stud Reports 2023; 41:100881. [PMID: 37208087 DOI: 10.1016/j.vprsr.2023.100881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 04/10/2023] [Accepted: 04/19/2023] [Indexed: 05/21/2023]
Abstract
Leishmania infantum infections have long been described in humans and dogs worldwide, but characterization of equine cases remains scarce. We describe the clinical evolution of a natural L. infantum infection to contribute to the diagnostic knowledge and epidemiology of equine leishmaniasis (EL). An auction-acquired four-year-old Mangalarga Marchador mare from Pernambuco state, presented a few subcutaneous nodules on the head and neck upon arrival at the purchaser's stud at Bahia state, in November of 2019. They progressed to multiple ulcerated and non-ulcerated nodules and spread to both right limbs in seven weeks. Hematology revealed anemia, lymphocytosis, monocytosis, and elevated plasma fibrinogen. Histopathology of the biopsied nodules identified a granulomatous dermatitis with macrophages containing Leishmania amastigotes. PCR detected Leishmania in skin lesions, but not in blood or spleen aspirate samples; ITS1 PCR-RFLP and DNA sequencing confirmed L. infantum species. A topical antiseptic and insect-repellent therapy and a monthly follow-up were established. All lesions improved progressively, without specific anti-Leishmania treatment, and 14 months later there was a consistent resolution. This first description of EL by L. infantum in an endemic area is relevant to emphasize the need for epidemiological studies, and to enhance clinicians' awareness for differential diagnosis.
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Affiliation(s)
- Flaviane Alves de Pinho
- Laboratory of Veterinary Infectious Diseases, Teaching Hospital of Veterinary Medicine, Federal University of Bahia, Av. Milton Santos 500, CEP: 40170-110, Salvador, BA, Brazil; Department of Veterinary Anatomy, Pathology and Clinics, School of Veterinary Medicine and Zootechny, Federal University of Bahia, Av. Milton Santos 500, CEP: 40170-110, Salvador, BA, Brazil
| | - Mariana Oliveira Mendes
- Laboratory of Veterinary Infectious Diseases, Teaching Hospital of Veterinary Medicine, Federal University of Bahia, Av. Milton Santos 500, CEP: 40170-110, Salvador, BA, Brazil
| | - Vitor Luiz Pereira de Magalhães
- Laboratory of Veterinary Infectious Diseases, Teaching Hospital of Veterinary Medicine, Federal University of Bahia, Av. Milton Santos 500, CEP: 40170-110, Salvador, BA, Brazil
| | | | | | - Felipe Dutra Rêgo
- Instituto Rene Rachou, Fundação Oswaldo Cruz, Av. Augusto de Lima, 1715 - Barro Preto, Belo Horizonte, CEP: 30190-009, MG, Brazil
| | - Rodrigo Pedro Soares
- Instituto Rene Rachou, Fundação Oswaldo Cruz, Av. Augusto de Lima, 1715 - Barro Preto, Belo Horizonte, CEP: 30190-009, MG, Brazil.
| | - Stella Maria Barrouin-Melo
- Laboratory of Veterinary Infectious Diseases, Teaching Hospital of Veterinary Medicine, Federal University of Bahia, Av. Milton Santos 500, CEP: 40170-110, Salvador, BA, Brazil; Department of Veterinary Anatomy, Pathology and Clinics, School of Veterinary Medicine and Zootechny, Federal University of Bahia, Av. Milton Santos 500, CEP: 40170-110, Salvador, BA, Brazil.
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Headley SA, Pimentel LA, de Amorim IFG, Amude AM, Viana NE, Muraro LS, Tafuri WL, Dos Santos MD. Immunohistochemical characterization of cutaneous leishmaniasis in cats from Central-west Brazil. VETERINARY PARASITOLOGY- REGIONAL STUDIES AND REPORTS 2019; 17:100290. [PMID: 31303238 DOI: 10.1016/j.vprsr.2019.100290] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 03/19/2019] [Accepted: 04/17/2019] [Indexed: 01/27/2023]
Abstract
Feline leishmaniasis (FeL) is an emerging infectious disease of cats caused by Leishmania infantum with global distribution. This study investigated the cause of chronic progressive cutaneous lesions in two cats from Central-west Brazil by using cytological, histopathologic, and immunohistochemical (IHC) analyses. Clinically, both cats had ulcerative cutaneous lesions at the nasal planum and ear resulting in a tentative diagnosis of squamous cell carcinoma (SCC). Moreover, both cats had varying degrees of onychogryphosis. However, cytology revealed chronic inflammatory reactions associated with intralesional amastigotes; histopathology confirmed chronic ulcerative dermatitis associated with intralesional and intracytoplasmic parasitic organisms consistent with amastigotes of Leishmania spp. within histiocytes. The IHC assay demonstrated that the intralesional parasitic structures identified by cytology and histopathology were immunoreactive to antigens of Leishmania spp., confirming the participation of this infectious disease agent in the development of the cutaneous lesions of these cats. The observation of onychogryphosis must be highlighted, since this lesion is frequently observed in dogs with visceral leishmaniasis but is underreported in FeL. Collectively, the pathologic and IHC findings of the chronic cutaneous disease confirmed active infections due to Leishmania spp. in these cats. Additionally, FeL with associated lesions to the ear and nasal planum must be considered as differential diagnosis for SCC in cats.
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Affiliation(s)
- Selwyn Arlington Headley
- Laboratory of Animal Pathology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Paraná, Brazil; Faculty of Veterinary Medicine and Programa de Pós-Graduação em Biociência Animal, Universidade de Cuiabá, Mato Grosso, Brazil.
| | - Luciano Anunciação Pimentel
- Laboratory of Veterinary Pathology, Universidade Federal do Recôncavo da Bahia, Cruz das Almas, Bahia, Brazil
| | - Izabela Ferreira Gontijo de Amorim
- Laboratorio de Patologia das Leishmanioses, Departamento de Patologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Alexandre Mendes Amude
- Faculty of Veterinary Medicine and Programa de Pós-Graduação em Biociência Animal, Universidade de Cuiabá, Mato Grosso, Brazil
| | - Nayara Emily Viana
- Laboratory of Animal Pathology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Paraná, Brazil
| | - Lívia Saab Muraro
- Faculty of Veterinary Medicine and Programa de Pós-Graduação em Biociência Animal, Universidade de Cuiabá, Mato Grosso, Brazil
| | - Wagner Luiz Tafuri
- Laboratorio de Patologia das Leishmanioses, Departamento de Patologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Marcelo Diniz Dos Santos
- Faculty of Veterinary Medicine and Programa de Pós-Graduação em Biociência Animal, Universidade de Cuiabá, Mato Grosso, Brazil
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