BACKGROUND AND OBJECTIVES Streptococcosis/lactococcosis is a hyperacute systemic disease that can occur in marine and fresh waters of many species of fish. The aim of this work was to study the disease outbreak in the major rainbow trout (Oncorhynchus mykiss) production of Iran. MATERIALS AND METHODS 108 Gram positive cocci isolates were obtained from diseased trout in seven provinces with ma...

A vaccination and challenge cohabitation model was established and evaluated using Nile tilapia (Oreochromis niloticus), the fluorescent chromophore calcein, and a Streptococcus iniae vaccine. Tilapia were non-invasively calcein marked, sham-vaccinated (CMSV) and cohabited with non-marked sham-vaccinated (NMSV) or non-marked S. iniae vaccinates (NMV) as a single unit. After 30 d, the cohabitant...

Streptococcus iniae was isolated from red-tail black shark(RTB shark) Epalzeorhynchos bicolor, and rainbow shark, E. erythrurus (fam: Cyprinidae), obtained from a local freshwater ornamental fish farm in Hillsborough county (FL). Darkening of the skin and lethargy were the first signs observed in infected sharks. Hemorrhages were observed on the ventral side of the body, on the head, and at the...

This is the first report of outbreaks of Streptococcus iniae in Nile tilapia farms in South America. Seven isolates were identified by biochemical, serological and molecular tests. Their 16S rRNA gene sequences showed 100% similarity with S. iniae ATCC 29178 and two distinct PFGE patterns were observed for Brazilian isolates.

Streptococcus iniae is associated with morbidity in commercial fish species, especially in olive flounders (Paralichthys olivaceus), and was recently identified as an emerging human pathogen. Here, we report the complete 2.09-Mb genome sequence of S. iniae strain YSFST01-82, isolated from an olive flounder with streptococcosis disease in Jeju, South Korea.

streptococcus iniae has emerged as an important fish pathogen over the last decade in farmed rainbow trout in iran. the main objective of this study was to evaluate the pathogenicity of s. iniae in poecilia reticulata . atotal of 60 apparently healthy p. reticulata were obtained from ornamental fish pet store and injected intraperitoneally with 1.5×10 6 cfu of bacteria. for 14 days after challe...

The salmonid macrophage-like cell line RTS-11 and purified trout pronephros phagocytes were used to analyze in vitro entry and survival of two Streptococcus iniae serotypes. Efficient invasion by S. iniae occurred in both cells, but only the type II strain persisted in pronephros phagocytes for at least 48 h. Ex vivo models of opsonin-dependent phagocytosis by pronephros phagocytes demonstrated...

The aquatic pathogen, Streptococcus iniae, is responsible for over 100 million dollars in annual losses for the aquaculture industry and is capable of causing systemic disease in both fish and humans. A better understanding of S. iniae disease pathogenesis requires an appropriate model system. The genetic tractability and the optical transparency of the early developmental stages of zebrafish a...

Zoonotic pathogens have the unique ability to cross the species barrier, causing disease in both humans and specific animal hosts. Streptococcus iniae is a zoonotic pathogen of both fish and humans, and the clinical presentations of S. iniae infections in fish and humans are very similar to those caused by various human-specific streptococcal pathogens. Virulence mechanisms required for infecti...