Diarrheal diseases often result from ingestion of contaminated water or food.
The population of La Paz, Bolivia is directly or indirectly exposed to the sewage-contaminated La Paz River.
We conducted a bacteriologic survey of the La Paz River to quantify the level of bacterial contamination, with particular reference to enteropathogens.
A total bacterial count exceeding 106 colony-forming units (CFU)/ml, including lactose fermenting and non-fermenting, gram-negative bacilli of approximately 105 CFU/ml, respectively, were detected in river water samples collected ncar two densely populated areas.
A total bacterial count of 105 CFU/ml was also detected at the most downstream area of the river near a sparsely populated area.
At four sampling locations, several enteropathogens were detected, including five enterotoxigenic Escherichia coli (ETEC) (serotype 06, O15, and 0159), two enteropathogenic E. coli (EPEC) (serotype 044), two enteroinvasive E. coli (EIEC) (serotype 029), and three Salmonella 04 group isolates.
The heat-labile enterotoxin gene and the invasive toxin gene were detected in all ETEC and EIEC isolates by polymerase chain reaction analysis.
Nine isolates of E. coli were found by the agar dilution method to be susceptible to ampicillin, kanamycin, nalidixic acid, tetracycline, and chloramphenicol, and ampicillin resistance was found in only two isolates of EIEC 7-4 (serotype 029) and EPEC 7-5 (serotype 044). (...)
Mots-clés Pascal : Exploration bactériologique, Eau rivière, Bolivie, Amérique du Sud, Amérique
Mots-clés Pascal anglais : Bacteriological investigation, River water, Bolivia, South America, America
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0531730
Code Inist : 002B30A02A. Création : 13/02/1998.