Table 1.

Frequency of Helicobacter pylori detected in different water samples in Iran by PCR.

Water sample	No. of samples	No. of H. pylori-positive by culture*	No. of H. pylori-positive by PCR
Tap water	50	2 (4.0%)	5 (10.0%)
Dental units' water	35	2 (5.8%)	4 (11.4%)
Bottled mineral water	20	0	0
Refrigerated water with filtration	30	0	1 (3.3%)
Tape water equipped with filtration system	25	0	0
Water cooler in public places	40	1 (2.5%)	4 (10.0%)
Total	200	5 (2.5 %)	14 (7.0%)

*Results expressed as the number of H. pylori-positive samples (percent positive samples analyzed).