BACKGROUND Streptococcus iniae is a Gram-positive bacterium and a severe pathogen of a wide range of farmed fish. S. iniae possesses a virulence-associated streptolysin S cluster composed of several components, one of which is SagE. SagE a transmembrane protein with one major extracellular region named ECR. This study aimed to develop a SagE-based DNA candidate vaccine against streptococcosis a...

Large-scale fish farming faces many environmental stresses, which affect their immune systems, growth performance, and physiological homeostasis, resulting in increase susceptibility to infections. Some of the most common bacterial infections cobia ( Rachycentron canadum ) include streptococcosis, vibriosis, furunculosis mycobacteriosis, pastelleurosis. Probiotics could be helpful reducing or l...

The article presents the results of studies on detection Streptococcus suis by real-time polymerase chain reaction. Isolation and species identification studied isolates streptococci was carried out according to morphological, cultural, biochemical biological properties conventional methods. study cultural characteristics growth using bacteriological methods brain heart infusion broth (BHI) BHI...

Lactococcosis has been defined as acute septicaemia, which causes economic losses in farmed fish, especially in rainbow trout. This study was done to evaluate the effects of Satureja bachtiarica and Nigella sativa essential oils on the efficacy of lactococcosis vaccine in rainbow trout. A total number of 270 fishes with a mean average of 120 g were obtained; they were randomly divided into nine...

Antibody production and clinical efficacy (relative percent survival RPS) were measured in 40±5g rainbow trout after immunization with two types of Streptococcus iniae vaccines consisting of formalin killed cells (FKC) and FKC enriched with the bacterial extracellular products (ECP) administered by intraperitoneal (i.p), immersion and oral routes at 16±1°C for 18 weeks. No significant differenc...

Abstract The current study aimed to investigate the efficacy of dietary thyme essential oil (TEO), Nigella sativa (NSEO), nano-emulsion (TEO-NE), and (NSEO-NE) in reducing total ammonia nitrogen (TAN), improving immune response, mitigating stress, acting as anti-inflammatory agents well preventing streptococcosis infection Oreochromis niloticus ( O. niloticus) . Fish N = 330, 14 ± 2 g) were div...

One approach to the management of common fish diseases in aquaculture is the use of antibiotic-laden feed. However, there are public concerns about the use of antibiotics in agriculture and the potential development of antibiotic resistant bacteria. Therefore, the discovery of other environmentally safe natural compounds as alternatives to antibiotics would benefit the aquaculture industries. F...