Aeromonas salmonicida subsp. salmonicida in rainbow trout ( Oncorhynchus mykiss)]]>

摘要

The rise of bacterial resistance to antibiotics is one of the great challenges of our age. One of the strategies to limit the development of antibiotics resistance is the investigation of alternative antimicrobials. As silver nanoparticles demonstrated a potent bactericidal activityin vitro, the aim of this study was to evaluate thein vivoantibacterial activity of silver nanoparticles againstAeromonas salmonicidasubsp.salmonicida.Rainbow trout (n?=?120) were divided into four groups of 30 fish each. First group was challenged withA.salmonicida(Positive control), the second group was challenged withA.salmonicidaand exposed to silver nanoparticles by immersion for three hours (100?μg/L), the third group was challenged withA.salmonicidaand intraperitoneally injected with silver nanoparticles (17?μg/mL) and the fourth group was sham-treated and served as a negative control group.At the 7th day post challenge, histopathology of the positive control group revealed the presence of bacterial aggregates in tissues with degenerative and necrotic changes, while at the 35th day post challenge, only liver necrosis persisted. Silver nanoparticles-treated and negative control groups did not show any clinical signs, mortalities or histopathological alterations and they were tested negative forA.salmonicida. The immersion in silver nanoparticles did not result in detectable residues of silver in the muscles 35?days after treatment.These findings demonstrate the antibacterial properties of silver nanoparticles againstA.salmonicidainfection. Therefore, they could be used for development of antibacterial agents in aquaculture.