Biotyping of Aeromonas isolates as a correlate to delineating a species-associated disease spectrum

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Abstract
Aeromonas isolates (147) from diverse clinical and environmental sources were subjected to the biotyping scheme of Popoff and Veron. Of the 147 isolates biotyped, 137 (93%) could be identified, with A. hydrophila predominating (48%) and equal percentages (25 to 27%) of the other 2 spp. (A. sobria and A. caviae). A number of additional biochemical properties were significantly associated with .gtoreq. 1 of these 3 spp. These included lysine decarboxylase activity, hemolysis of sheep erythrocytes, lecithinase production, staphylolytic activity, arbutin hydrolysis and acid production from various carbohydrates. By incorporating these phenotypic properties into an extended biotyping system, 98% of the isolates were identified. Selective distribution of individual species with respect to certain body sites was noted.