Abstract
A total of 23,007 clinical samples, 2,001 were identified as Escherichia coli (E.coli). Among these, 205 strains were haemolytic. One hundred eighty one E.coli were found haemolytic among urinary isolates. Two tests i.e. salt aggregation test (SAT) and haemagglutination test (HAT) with human type A erythrocytes were performed to know the incidence of fimbriated strains amongst haemolytic E.coli isolates. Mannose resistant haemagglutination and Mannose sensitive haemagglutination was observed in 95 (46.34%) and 15 (7.31%) strains respectively. Whereas cell surface hydrophobicity was shown by 139 (67.80%) strains. Seventy nine (38.53%) strains were both SAT and HAT positive. Twenty nine (14.14%) strains were both SAT and HAT negative i.e. non-fimbriated strains. Among urinary isolates, 21.8% were found to possess both haemolytic and haemagglutinating activity. Haemolytic activity of E.coli was found associated with fimbriated strains. Thus, both act as virulence factors for the pathogenesis of Urinary Tract Infection.
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