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Volume 31, Number 5—May 2025
Research Letter

Autochthonous Leishmania (Viannia) lainsoni in Dog, Rio de Janeiro State, Brazil, 2023

Isabela Cordeiro da Silva Santos, Daniel Moreira de Avelar, Luciana de Freitas Campos Miranda, Artur Augusto Velho Mendes Júnior, Lucas Keidel Oliveira, Luanna da Silva Ventura, Aline Fagundes da Silva, Fernanda Nunes Santos, Liliane de Fátima Antônio Oliveira, Rodrigo Caldas Menezes1, and Andreza Pain Marcelino1Comments to Author 
Author affiliation: Fundação Oswaldo Cruz, Rio de Janeiro, Brazil (I.C.d.S. Santos, L.d.F.C. Miranda, L.K. Oliveira, L.d.S. Ventura, A.F. da Silva, F.N. Santos, L.d.F.A. Oliveira, R.C. Menezes, A.P. Marcelino); Fundação Oswaldo Cruz, Belo Horizonte, Brazil (D.M. de Avelar); Instituto Carlos Chagas, Curitiba, Brazil (A.A.V.M. Júnior)

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Figure 1

Histologic sections from autochthonous Leishmania (Viannia) lainsoni in dog (Canis familiaris), Rio de Janeiro state, Brazil, 2023. A, B) Skin of the examined dog: hyperkeratosis and moderate granulomatous infiltrate in the dermis are composed mainly of macrophages, with a smaller number of plasma cells and lymphocytes (A) and red-stained amastigotes in the cytoplasm of macrophages (arrows) (B). C, D) Spleen of the examined dog: lymphoid hyperplasia (C) and red-stained amastigotes in the cytoplasm of macrophages in the parenchyma (arrows) (D). A, C) Hematoxylin-eosin stain; B, D) immunohistochemistry. Scale bars indicate 10 µm.

Figure 1. Histologic sections from autochthonous Leishmania (Viannia) lainsoni in dog (Canis familiaris), Rio de Janeiro state, Brazil, 2023. A, B) Skin of the examined dog: hyperkeratosis and moderate granulomatous infiltrate in the dermis are composed mainly of macrophages, with a smaller number of plasma cells and lymphocytes (A) and red-stained amastigotes in the cytoplasm of macrophages (arrows) (B). C, D) Spleen of the examined dog: lymphoid hyperplasia (C) and red-stained amastigotes in the cytoplasm of macrophages in the parenchyma (arrows) (D). A, C) Hematoxylin-eosin stain; B, D) immunohistochemistry. Scale bars indicate 10 µm.

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1These authors contributed equally to this article.

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