E. coli bacteria: E. Drinking water infected with E. coli bacteria can cause intestinal infection. This infection can cause diarrhea, abdominal pain, and sometimes bloody stools. E. When infected with E. coli bacteria, urinary tract infection can also occur. E. If infected with E. coli bacteria, serious diseases like food poisoning or pneumonia can also occur. E. If infected with E. coli bacteria, serious problems can also occur in blood and kidneys .