Lactococcus garvieae and Streptococcus iniae infections in rainbow trout Oncorhynchus mykiss: similar, but different diseases.
نویسندگان
چکیده
Clinical and macroscopic findings (anorexia, lethargy, loss of orientation and exophthalmia) indicate that Streptococcus iniae and Lactococcus garvieae infections of trout share some common features, but histopathology reveals notable differences between the 2 diseases. Meningitis and panophthalmitis are the main lesions among S. iniae infected trout, whereas L. garvieae infection results in a hyperacute systemic disease. Differences in the LD50s of the 2 pathogens and the sudden onset of signs and death correlate with the histopathological findings, indicating the severity of L. garvieae infection of trout.
منابع مشابه
Serum antibody response of rainbow trout, Oncorhynchus mykiss to two species of pathogenic bacteria; Streptococcus iniae and Lactococcus garviae
One of the most important bacterial diseases in aquaculture is Streptococosis/loctococosis. Meanwhile this disease has been known as a zoonosis disease, and then fish vaccination against this disease is important. In this study the specific immunological responses of rainbow trout (Oncorhynchus mykiss) to vaccination with bivalent lactococcal/streptococcal vaccine were investigated. Two hundred...
متن کاملIdentification of Lactococcus garvieae by PCR.
Lactococcus garvieae junior synonym Enterococcus seriolicida) is an emerging zoonotic agent isolated from economically important fish (rainbow trout and yellowtail), from cattle, and from humans. Clindamycin susceptibility is the only phenotypic test which can differentiate L. garvieae from Lactococcus lactis, another emerging agent in humans. A PCR assay for the identification of L. garvieae w...
متن کاملMolecular epidemiology of zoonotic streptococcosis/lactococcosis in rainbow trout (Oncorhynchus mykiss) aquaculture in Iran
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...
متن کاملHumoral and non-specific immune responses in rainbow trout (Oncorhynchus mykiss) naturally exposed to and immunized with Streptococcus iniae
In this study, immune responses against Streptococcus iniae infections in rainbow trout (Oncorhynchus mykiss) were analyzed. Anti-streptococcal antibody (ASA) levels, respiratory burst activity (RBA), phagocytic activity (PA) and phagocytic index (P index) were measured in kidney macrophages. Fish were allocated to three experimental groups (n = 50 per group): survivors of natural S. iniae inf...
متن کاملResearch Article: Biotyping and serotyping of Lactococcus garvieae isolates in affected farmed rainbow trout (Oncorhynchus mykiss) in north Iran
The incidence of Lactococcosis caused by Lactococcus garvieae, in rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) farms is disquieting and increasing in recent years. Knowledge of biotypes and serotypes involved in disease incidence is essential to adopt disease prevention and control policies. Twelve isolates of L. garvieae from some rainbow trout farms were identified by phenotypic, bioche...
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عنوان ژورنال:
- Diseases of aquatic organisms
دوره 36 3 شماره
صفحات -
تاریخ انتشار 1999