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Seasonal fluctuations in Babesia bigemina and Rhipicephalus microplus in Brangus and Nellore cattle reared in the Cerrado biome, Brazil

Article scientifique 2022 Anglais

Résumé

Abstract Background: Rhipicephalus microplus (Ixodida: Ixodidae, Canestrini, 1888) is a tick that causes great economic and health losses related to the cattle industry and is the main vector of Babesia bigemina (Piroplasmidae: Babesidae, Smith & Kilborne, 1893). B. bigemina is responsible for a tick-borne disease known as babesiosis that can cause hemolytic anemia, fever, and death. This study investigated the relationship between the number of ticks per animal and the number of B. bigemina cbisg gene copies in the blood of Brangus and Nellore cattle reared without acaricidal treatment in the Brazilian Cerrado over a one-year period.Methods: The ticks on 19 animals (9 Brangus and 10 Nellore cattle) were counted every 18 days, and blood was collected every 36 days for 12 months. Serological samples were analyzed with iELISA. Genomic DNA (gDNA) was analyzed by PCR and qPCR. The PCR products were sequenced by the Sanger method.Results: These two breeds showed similar weight development and no clinical signs of babesiosis. Statistically significant differences (p< 0.05) were observed in the number of ticks and the number of B. bigemina cbisg gene copies between the breeds.Conclusion: No babesiosis clinical signs were observed, and no correlation between the number of ticks and the number of circulating copies of cbisg was observed.

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Martins, K., Andreotti, R., Higa, L., Bonatte-Junior, P., Duarte, P., Barros, J., Garcia, M., Csordas, B., Zimmerman, N. (2022). Seasonal fluctuations in Babesia bigemina and Rhipicephalus microplus in Brangus and Nellore cattle reared in the Cerrado biome, Brazil. https://doi.org/10.21203/rs.3.rs-1670724/v1

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Auteur(s)

Kauê Rodriguez Martins Renato Andreotti Leandro de Oliveira Souza Higa Paulino Bonatte-Junior Pâmella Oliveira Duarte Jacqueline Cavalcante Barros Marcos Valério Garcia Bárbara Guimarães Csordas Namor Pinheiro Zimmerman

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