• Murooj abbas buhlool
Keywords: : coliform group, , diarrheal cases


     Sewage or human excrement that contaminated the water offers the greatest risk to public health associated with drinking water,and pathogens present in water are usually greatly predominated by normal intestinal bacteria, which are isolate and identify very easier . The coliform group traits consideration as an indicator of water pollution because these bacteria are always present in the intestinal tracts of humans and other warm-blooded animals and are excreted in large numbers in faecal wastes , so in case of discharging sewage disposals under untreated conditions. Multiple tubes fermentation method was used in present paper, included measurement of Most Probable Number of E.coli which incubated under 44 C°.Results of our present study revealed that Al-Garaf River contaminated greatiy with coliform group , and all samples that collected from the river and from different stations was contaminated with bacteria where the st.3 was the most contamination. Contamination was higher during the summer followed by the autumn where it was higher relation in this two seasons (773,506) respectively. It was be recorded higher in diarrheal cases in Al-Nassiriya city in the same two seasons where the values was (240, 235) respectively. While it was lower in winter (256) diarrheal case. The cause of this intense contamination is increasing human activities and appropriate environmental for bacterial growth in simmer,s months.The presence of E.Coli strains in water is indicator of water contamination in other intestinal bacteria that formed danger on the general health.

Conclusions of present study confirmed that the main cause of contamination is sewage influents that discharge in the river without treatment that leads to spread of coliform group in the water and that contributing to high diarrheal cases.


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