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Year : 1993  |  Volume : 11  |  Issue : 3  |  Page : 197-202

Comparison Of Toxigenicity In Aeromonas Strains Isolated From Different Sources



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S Sujatha


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Fifty-three strains of Aeromonas isolated from intestinal (34) and extra-intestinal sources (19) were studied for the production of cytotoxin in vero cells, hemolysin against rat and rabbit erythrocytes, skin reactive factor in rabbit and enterotoxin in rat and rabbit ileal loop tests with the objective of detecting any differences that might exist in the virulence of faecal and non-faecal isolates of Aeromonas. Irrespective of the sources or species, 92.5% of the strains were found to elaborate one or other toxins. Hemolysin was produced by 84.9%, heat-sensitive skin reactive factor by 67.9% and cytotoxin by 39.6% of strains. The culture supernatants were found to be lethal for rabbits and rats when inoculated in ligated intestinal loops. A. hydophila was more toxigenic than A.caviae and A. sobria. The production of cytotoxin and SPF was found to be significantly different in extra-intestinal and intestinal isolates. Such a difference was not observed with hemolysin production.






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2004 - Indian Journal of Medical Microbiology
Published by Wolters Kluwer - Medknow

Online since April 2001, new site since 1st August '04