| Autor: |
Ghosh, Asit R., Nair, G. Balakrish, Naik, Trailokya N., Sarkar, Swarup K., Mazumdar, Rabin, Pal, Sudhir C., Sen, Dipak |
| Zdroj: |
Microbiology and Immunology; April 1991, Vol. 35 Issue: 4 p273-287, 15p |
| Abstrakt: |
For a period of one year (March 1987 to February 1988), the incidence of Escherichia coliwas determined in water, sediment and plankton collected from two sampling sites in a freshwater lake extensively used by humans and animals. Densities of E. coliassociated with plankton was the lowest while sediments, especially at site 2, harbored high densities of the organism. Correlation coefficients revealed that the density of E. coliin water samples was linearly correlated to temperature, pH of water, sediment and humidity. Stepwise multiple regression analysis, however, showed that sediment temperature was the dominant variable which could explain 27% of the observed variation in the numbers of E. coliin the overlying waters (p= <0.001). Of the 150 environmental E. colistrains which were characterized, 31 (20.7%) were found to belong to the classic enteropathogenic E. coli(EPEC) serogroups. Seven of the serogroups among the environmental EPEC strains were also encountered from EPEC strains isolated from human cases during a concurrent clinical study. None of the 150 environmental strains were enterotoxigenic or enteroinvasive but 4 strains possessed HEp‐2 cell adhesive factor. With the exception of one, all the EPEC strains isolated were multi‐drug resistant. From this study, it was evident that the lake is an important source of infection of EPEC and other related diarrheagenic E. coli. |
| Databáze: |
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