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Expanding the universe of Piroplasmids: morphological detection and phylogenetic positioning of putative novel piroplasmids in black-eared opossums (Didelphis aurita) from southeastern Brazil, with description of “South American Marsupialia Group” of Piroplasmida

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Abstract

The growing proximity of wildlife to large urban niches arouses greater interest in understanding wild reservoirs in the epidemiology of diseases of importance to animal and human health. The aim of the present study was to investigate the presence of piroplasmids in opossums rescued from the metropolitan region of Rio de Janeiro state, Brazil. Blood and bone marrow samples were collected from 15 Didelphis aurita and subjected to DNA extraction and PCR using primers for the 18S rRNA, cox1, cox3, and hsp70 genes of piroplasmids. Clinical and hematological evaluation of the animals was also performed. Five (33.3%) of the 15 opossums tested positive for piroplasms in the nested PCR based on the 18S rRNA, and in two animals, it was possible to observe intra-erythrocytic structures compatible with merozoites. One of the positive animals showed clinical signs of infection such as jaundice, fever, and apathy. Anemia, low level of plasma protein, leukocytosis, and regenerative erythrocyte signs were observed in positive animals. Phylogenetic analysis based on both 18S rRNA and cox-3 genes demonstrated that the piroplasmids detected in D. aurita formed a unique sub-clade, albeit related to piroplasmids previously detected in Didelphis albiventris and associated ticks from Brazil. This study proposes the novel Piroplasmida Clade, namely “South American Marsupialia Group,” and reinforces the need for new clinical-epidemiological surveys to understand the dynamics of these infections in didelphids in Brazil.

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The datasets supporting the conclusions of this article are included within the article. Raw data are available from the corresponding author.

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Funding

This work was supported by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) with the Productivity Scholarship for MRA (CNPq Process nº 303701/2021–8), by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Código 001) and by Research Support Foundation of the State of São Paulo (Process No. 2020/12037–0 granted to the MRA).

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Contributions

ÁFXO: writing of the original article and collecting samples. CBD: supervision and revision of the writing of the original article. ACC, MRA, and RZM: supervision and performance of molecular and phylogenetic analyses. NVS, ENM, ACC, and ABRG: support in carrying out hematological and morphometric analyses. AVS and DAB: supervision and performance of sample collections and animal clinical management. AG and JMR: support in DNA extractions, writing, and adequacy to the norms for article submission.

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Correspondence to Cristiane Divan Baldani.

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Competing interests

The authors declare no competing interests.

Ethics approval and consent to participate

Biological samples in this study were obtained following the directions of the Instituto Chico Mendes de Conservação da Biodiversidade (license number 76330–1) and the Ethics Committee of Universidade Estácio de Sá (number 009/ 2021).

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The authors declare no competing interests.

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Section Editor: Daniel Howe

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Oliveira, Á.F.X., Calchi, A.C., Stocco, A.V. et al. Expanding the universe of Piroplasmids: morphological detection and phylogenetic positioning of putative novel piroplasmids in black-eared opossums (Didelphis aurita) from southeastern Brazil, with description of “South American Marsupialia Group” of Piroplasmida. Parasitol Res 122, 1519–1530 (2023). https://doi.org/10.1007/s00436-023-07852-0

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  • DOI: https://doi.org/10.1007/s00436-023-07852-0

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