Isolates Of Edwardsiella Tarda Research Articles

In vitro susceptibilities of Edwardsiella tarda to 22 antibiotics and antibiotic-β-lactamase-inhibitor agents

The in vitro susceptibilities of 22 isolates of Edwardsiella tarda were studied with 22 antibiotics and antibiotic-beta-lactamase-inhibitor agents. Results indicated that all isolates were susceptible to the aminoglycosides, cephalosporins, penicillins, imipenem, aztreonam, ciprofloxacin, and antibiotic-beta-lactamase-inhibitor agents. Each strain produced a beta-lactamase even though no resistance was detected to the beta-lactams.

Antimicrobial susceptibility of Edwardsiella tarda from the United States and Taiwan

Edwardsiella tarda isolates from the United and States and Taiwan were screened against 37 antimicrobial agents. These isolates were highly susceptible to the amino-glycosides, second and third generation cephalosporins, newer penicillins, nitrofurantoin, sulfamethoxazole/trimethoprim, and the quinolones. Source-related resistance was found for penicillin G, sulfadiazine, colistin, novobiocin, spectinomycin, ampicillin, tetra-cycline, and chloramphenicol. Generally, the Taiwan isolates were more resistant than the United States isolates.

Biochemical and enzymatic characterization of Edwardsiella tarda from the United States and Taiwan.

One hundred sixteen isolates of Edwardsiella tarda were collected from the United States and Taiwan were biochemically characterized. This species is basically homogenous and has limited substrate utilization capacities. Taiwan isolates differ from the United States isolates in some respects (i.e. mannitol fermentation, motility, hydrogen sulfide production, gas production, and chondroitin sulfate degradation) particulary when incubated at 42°C.

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Four hundred and forty five isolates of Edwardsiella tarda were collected on field surveys in eel culture ponds in Shizuoka Prefecture in 1980 and 1981. Two hundred and seventy isolates (61%) were classified, according to O-agglutination test, into four serotypes (A, B, C and D).There were no great differences in the composition of the serotypes among the following three kinds of samples; rectum contents of eel, eel pond water and pond sediments (A: 13-17%, B: 22 35%, C: 4-13%, D: 2-4%). However, serotype A was predominant in kidney samples (A: 72%, B: 0%, C: 3%, D: 13%).By experimental infection to eel, tilapia and loach, serotype A of E. tarda proved highly virulent to the fishes, especially to eel, in comparison with the other serotypes tested.

Frequent isolation of Edwardsiella tarda and Pleisiomonas shigelloides from healthy Zairese freshwater fish: a possible source of sporadic diarrhea in the tropics.

The intestinal contents of 59 Zairese freshwater fish were examined for the presence of potential human enteric pathogens. Edwardsiella tarda and Plesiomonas shigelloides were isolated from 57 and 59% of them, respectively. For both microorganisms there was a significant difference between the isolation rates from lake and river fish: whereas E. tarda was much more frequently isolated from lake fish than was P. shigelloides, the reverse was observed for river fish. The authors hypothesize that sporadic cases of tropical diarrhea with E. tarda or P. shigelloides can be traced to contact with or consumption of freshwater fish.

Isolation of Edwardsiella tarda from three Oregon sea mammals.

Edwardsiella tarda was isolated from the peritoneal exudate of a Steller's sea lion (Eumetopias jubata) with peritonitis resulting from a perforating colonic ulcer; from the liver of a harbor porpoise (Phocena phocena) with metritis and peritonitis sequela to dystocia; and from the liver of a California sea lion (Zalophus californianus) with peritonitis following fracture and necrosis of a lumbar vertebrae. These findings indicate E. tarda is a common opportunistic invader in sick or injured marine mammals.

Isolation of Edwardsiella tarda from Swine

Edwardsiella tarda was isolated from the intestinal tract of a 2-month-old pig. This is the first reported isolation of Edwardsiella tarda from swine in the United States. Swine have been reported as potential carriers of Edwardsiella tarda, but pathogenicity of this organism for swine has not been determined. Although the pig had access to several farm ponds, the exact source of infection was not determined.