ON THE ECOLOGY OF PLESIOMONAS-SHIGELLOIDES

  • 1 January 1981
    • journal article
    • research article
    • Vol. 172  (6) , 528-533
Abstract
Studies on the generation time of P. shigelloides and its relation to incubation temperature have shown that this species in marked contrast to Aeromonas hydrophila does not multiply in temperatures below 8.degree. C. These findings would explain the seasonal variations in the number of isolates from river-water observed in Japan. Colony counts of P. shigelloides organisms on IBG-agar from water of the river Main sampled during the month of Aug. (water temperature 20.degree. C) have shown numbers of 10-100 c.f.u[colony-forming units]/ml. P. shigelloides is present in surface water in Middle Europe. The presence of the germs could equally be demonstrated in the guts of many specimens of non-preying fish that were caught during July and Aug. When determining the bacterial species isolated from such material the possible presence of inositol-positive A. hydrophila strains has to be taken into account. Results of former studies on the suitability of Leifson-agar, Wilson-Blair-agar, SS-agar and IBG-agar then with pure cultures were confirmed by work with fecal material from fish done this time. While favorable results were obtained on IBG- and SS-agar, P. shigelloides could in no case be cultured on Leifson- and Wilson-Blair-agar.

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