Detection of Helicobacter pylori peruvian water sources by two PCR assays based on independent genes: K. Hulten, S.W. Han; F.A.K. El-Zaatari, D.G. Evans, P.D. Klein, A.R. Opekun, R.H. Gilman, D.Y. Graham, L. Engstrand. Dept. of Medicine, VA Medical Center and Baylor College of Medicine, Houston TX, A.B. Prisma, Lima, Peru, the Johns Hopkins University, Baltimore, MD and Dept. of Clinical Microbiology, University Hospital, Uppsala, Sweden