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01-12-2020 | Petechiae | Original Article

Experimental infection by Aeromonas hydrophila in Piaractus mesopotamicus: DL50, neurological disturbances, and mortality

Authors: Gustavo S. Claudiano, Flávio Ruas de Moraes, Dayanne C. Fernandes, Juliana S. Vantini, Jefferson Yunis-Aguinaga, Silas F. Eto, Fausto A. Marinho-Neto, Hugo J. A. Macedo, Wilson G. Manrique, Julieta R. E. Moraes

Published in: Comparative Clinical Pathology | Issue 6/2020

Abstract

Aeromonosis is an infectious disease of high occurrence in captive fish. It manifests mainly as hemorrhagic septicemia. This study aimed to evaluate the physiopathology manifestations of septic aeromonosis in Piaractus mesopotamicus, considering its clinical manifestations, mortality rates, anatomopathology, and anti-iNOS immunolabeling in the brain. Fish were inoculated in the coelomic cavity with increasing concentrations of A. hydrophila: 1.5 × 10⁸; 1.8 × 10⁸; 2.1 × 10⁸; 2.4 × 10⁸; 2.7 × 10⁸ CF mL⁻¹, histopathology, and anti-iNOS immunolabeling in brain. The animals present erratic swimming (swirling), depigmentation, petechiae, skin suffusions, and high mortality rates up to 100% according to the inoculum concentration. The DL50-96 h was estimated in 1.806 × 10⁸ CFU mL⁻¹. Fish inoculated with 2.1 × 10⁸ CFU mL⁻¹ presented 100% mortality rate. Fish presented neurological signs, congestion, extensive hemorrhage, and glial cells activity confirmed by the anti-iNOS labelling. In addition, the inoculated bacteria was reisolated from the brains. The results demonstrated that aeromonosis physiopathology is multifactorial and the observed neurological signs were caused by the inoculated bacteria. These findings highlight the need for differential diagnosis with other infections that produce encephalitis.

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Title: Experimental infection by Aeromonas hydrophila in Piaractus mesopotamicus: DL50, neurological disturbances, and mortality
Authors: Gustavo S. Claudiano
Flávio Ruas de Moraes
Dayanne C. Fernandes
Juliana S. Vantini
Jefferson Yunis-Aguinaga
Silas F. Eto
Fausto A. Marinho-Neto
Hugo J. A. Macedo
Wilson G. Manrique
Julieta R. E. Moraes
Publication date: 01-12-2020
Publisher: Springer London
Keywords: Petechiae
Septicemia
Septicemia
Published in: Comparative Clinical Pathology / Issue 6/2020
Print ISSN: 1618-5641
Electronic ISSN: 1618-565X
DOI: https://doi.org/10.1007/s00580-020-03159-z

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Experimental infection by Aeromonas hydrophila in Piaractus mesopotamicus: DL50, neurological disturbances, and mortality

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