Characterization of Streptococcus iniae isolated from ornamental cyprinid fishes and development of challenge models

  title={Characterization of Streptococcus iniae isolated from ornamental cyprinid fishes and development of challenge models},
  author={Riccardo Russo and Hugh Mitchell and Roy P. Yanong},

Tables from this paper

Pathomorphology of experimental Streptococcus iniae infection in tilapia (Oreochromis niloticus)

An experimental infection with Streptococcus iniae was conducted with tilapia, and dense bacterial clusters were observed in the sinusoids of the spleen, while lymphocytes and macrophage infiltrations were found in the heart and intestinal tissues.

Short Communication Experimental study to evaluate the pathogenicity of Streptococcus iniae in Guppy (Poecilia reticulata)

P. reticulata is susceptible to streptococcosis and can play an important role in transmission of the disease to other ornamental fish species and also cultured fish.

Streptococcus iniae Isolated from Channel Catfish (Ictalurus punctatus) in China

A new infectious disease was characterized in channel catfish (Ictalurus punctatus) in Guangxi Province, China, and Koch’s postulate was fulfilled using the authors' strain (labeled DGX07) in healthy channel cat fish.

First report of Streptococcus iniae in red porgy (Pagrus pagrus, L.).

This work describes the first isolation of Streptococcus iniae in red porgy, Pagrus pagrus (L.), and the first European isolation of this pathogen in gilthead seabream, Sparus aurata (L.). In both

First identification and characterization of Streptococcus iniae obtained from tilapia (Oreochromis aureus) farmed in Mexico.

The obtained data clearly indicate a relationship between intensified aquaculture activities in Mexico and new disease appearances, and should establish clinical significances for the tilapia industry.

Outbreaks of Streptococcosis associated with Streptococcus iniae in Siberian sturgeon (Acipenser baerii) in China

Results indicated that S. iniae could act as a pathogen of farmed A. baerii, the first report of S. iniae infection associated with mass mortality in A. Baerii.

Isolation and characterization of the Enterococcus faecalis strain isolated from red tilapia (Oreochromis hybrid) in Indonesia: A preliminary report

It is concluded that E. faecalis were found as the cause of streptococcosis, infecting and causing mild lesions in red tilapia and this finding is the first report of isolation and characterisation of the E. Faecalis strain isolated from red Tilapia in Indonesia.

Main bacterial species causing clinical disease in ornamental freshwater fish in Brazil.

MALDI-TOF MS showed to be a rapid method for diagnosis of bacterial disease outbreaks in ornamental fish establishments and was shown to be the main causative bacterial agents of infection in Ornamental fish with different clinical signs.


According to this study, Streptococcus iniae as a zoonisis can be survived at least 38 month in freezing temperature (at -20˚C) in fish products, so the potential pathogenicity of this bacterium should be concerned in affected area as well as imported frozen fish.



Streptococcus iniae infections in Red Sea cage-cultured and wild fishes.

Biochemical and molecular similarities between the isolates from cultured fishes and those from the wild specimens suggest that a single strain is involved, and that 'amplification' and dispersal of this pathogen from captive to feral fishes have occurred.

Streptococcus iniae Associated with Mortality of Tilapia nilotica × T. aurea Hybrids

The cause of an ongoing mortality of hybrid tilapias Tilapia nilotica × T. aurea in a Texas fish farm was a biotype of Streptococcus iniae, the first record of this bacterial species affecting fish in the USA.

Histopathology of Hybrid Tilapias Infected witha Biotype of Streptococcus iniae

A systemic streptococcal disease caused by a biotype of Streptococcus iniae affecting hybrids of Nile tilapia Tilapia nilotica × bluetilapia T. aurea at a commercial aquaculture facility in central Texas was investigated, revealing a general septicemia with the occurrence of cellular infiltration and numerous cocci in most organ systems.

Studies on the pathogenesis of streptococcal infection in cultured yellowtails Seriola spp.: the fate of Streptococcus sp. bacteria after inoculation

The growth of the bacteria in the fish body at various periods after either per-oral or per-cutaneous challenge with Streptococcus sp.

Invasive infections due to a fish pathogen, Streptococcus iniae. S. iniae Study Group.

A clone of S. iniae that causes invasive disease in both humans and fish is identified that can produce invasive infection after skin injuries during the handling of fresh fish grown by aquaculture.

Pharmacokinetic Studies of Florfenicol in Koi Carp and Threespot Gourami Trichogaster trichopterus after Oral and Intramuscular Treatment

Analysis of florfenicol leaching from fish feed indicated that about 50–80% of the coated drug is lost and is not available for therapeutic benefit for either species.

Laboratory Efficacy of Amoxicillin for the Control of Streptococcus iniae Infection in Blue Tilapia

Oral administration of AMX-medicated feed for 12 d at a daily rate of 10, 30, and 80 mg/kg BW significantly increased the survival of S. iniae−infected tilapia from 3.8% in the challenged, nonmedicated positive control to 45, 75, and 93.8%, respectively.

Studies on the pathogenesis of streptococcal infection in cultured yellowtails Seriola spp.: effect of the cell free culture on experimental streptococcal infection.

Intramuscular inoculation with either low virulent or virulent bacteria alone at dosages of 106 to 107 cells did not produce the disease in the fish, with almost complete clearance of the bacteria from the viscera and blood within 120 h, when the exotoxin was inoculated intramUScularly prior to the bacterial challenge.

Passive immunization of tilapia, Oreochromis niloticus (L.), with anti-Streptococcus iniae whole sera

Results suggest that immunity provided by ASI and HIASI was because of antibody against S. iniae, and inactivation of complement in theHIASI treatment further suggests that ASI antibody plays a primary role in immunity against S iniae.