Morphological, microbiological and ultrastructural aspects of sepsis by Aeromonas hydrophila in Piaractus mesopotamicus

Autoři: Fausto A. Marinho-Neto aff001;  Gustavo S. Claudiano aff001;  Jefferson Yunis-Aguinaga aff003;  Victor A. Cueva-Quiroz aff003;  Karina K. Kobashigawa aff004;  Nathan R. N. Cruz aff001;  Flávio R. Moraes aff001;  Julieta R. E. Moraes aff001
Působiště autorů: Departament of Veterinary Pathology, School of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, Brazil aff001;  Institute of Biodiversity and Forests, Federal University of Western Pará (UFOPA), Santarém, Pará, Brazil aff002;  Aquaculture Center of UNESP, Jaboticabal, São Paulo, Brazil aff003;  Departament of Veterinary Surgery and Clinic, School of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, Brazil aff004
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: 10.1371/journal.pone.0222626


Aeromonas bacteria can cause an infection characterized by septicemia and is one of the most common pathogens in tropical fish. This disease is responsible for high morbidity and mortality rates, causing considerable losses in aquaculture. Thus, the understanding of its pathophysiology is crucial to develop control strategies of this bacterial infection in farmed fish. This study aimed to characterize early pathological aspects of acute sepsis in pacu (Piaractus mesopotamicus) experimentally infected with Aeromonas hydrophila. A total of 160 juvenile pacus were inoculated intraperitoneally with A. hydrophila (1.78 x 109 CFU/mL) and at 0 (control), 1, 3, 6, and 9 hours post-inoculation (hpi), animals were anesthetized and samples were collected for microbiological, light microscopy and transmission electron microscopy (TEM) analyzes. The results showed the occurrence of hemodynamic alterations, such as hemorrhage and congestion, which were observed mainly after 6 and 9 hpi. It was possible to re-isolate Aeromonas at all sampling times except in control group. However, just after 9 hpi it was possible to find the bacteria in all fish and tissues. Light microscopy analyses revealed a degenerative process, necrosis and vascular damage mainly at 6 and 9 hpi. According to the ultrastructural examination, areas of cellular death were identified in all examined tissues, especially at 6 and 9 hpi. However, the most severe, related to necrosis, were observed after 6 and 9 hpi. The findings suggested that this bacterium spreads in the first hpi through the fish organs, mainly affecting spleen, liver and kidney, causing irreversible lesions at the molecular level.

Klíčová slova:

Biology and life sciences – Organisms – Bacteria – Aeromonas – Aeromonas hydrophila – Microbiology – Medical microbiology – Microbial pathogens – Bacterial pathogens – Anatomy – Renal system – Kidneys – Body fluids – Blood – Physiology – Spleen – Cell biology – Cellular structures and organelles – Endoplasmic reticulum – Cell processes – Secretory pathway – Medicine and health sciences – Pathology and laboratory medicine – Pathogens – Hemorrhage – Necrosis – Diagnostic medicine – Signs and symptoms – Lesions – Vascular medicine – Immune physiology


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