The high number of the strains of Escherichia coli (E. coli) isolated from faeces, demonstrated that this bacteria takes the first place in diarrhoea. These isolations had the same frequency all the year long. In infants, the enteropathogenic E. coli (E. P. E. C.) (28.57%) are still frequent contrary to developed countries. The E. coli with hemagglutination phenomenon (colonisation factors) but without toxin detected were also responsible (mortality 6%). The E. coli without toxin and not belonging to E. P. E. C. group were also frequent (71.42%). In adults, only the enteroinvasive E. coli (E. I. E. C.) (16.6%) and the E. coli with hemagglutination but without toxin detected (16.6%) were observed. This situation is due to bad hygienic conditions among the people and the tropical climate.
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