Abstract
Aeromonas salmonicida was isolated from red spot emperor, king soldier bream, white-spotted rabbit fish and tilapia, and an invertebrate (abalone) in Oman during December 2011–May 2012. The cytotoxic enterotoxin ast gene was found widely distributed among the isolates; aerolysin-like protein (act) and the flagellin structural gene lafA less so; and the nuclease gene (nuc) not at all. However, there was not any evidence of pathogenicity among the isolates when tested in laboratory-based experiments using rainbow trout and Nile tilapia. Therefore, the risk of the pathogen to fish in Oman is unclear.
Highlights
IntroductionInt Aquat Res (2018) 10:145–152 there is a need to continuously assess the presence of several accepted virulence factors in Aeromonas isolates for better understanding of the overall pathogenesis of infections (Sen and Rodgers 2004)
Aeromonas salmonicida is the aetiological agent of furunculosis in salmonids and causes ulcer disease in cyprinids and marine flatfish (Austin and Austin 2016)
Numerous virulence factors, such as surface polysaccharides, iron-binding systems, exotoxins and extracellular enzymes, secretion systems, fimbriae and flagella, contribute to pathogenesis of fish and human diseases caused by Aeromonas spp., none of the factors alone are responsible for all of the clinical signs of disease presented during an infection (Ali et al 1996)
Summary
Int Aquat Res (2018) 10:145–152 there is a need to continuously assess the presence of several accepted virulence factors in Aeromonas isolates for better understanding of the overall pathogenesis of infections (Sen and Rodgers 2004). The present study was undertaken to investigate the pathogenicity of strains of A. salmonicida recovered from a range of aquatic animals in Oman
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