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The treatment of sewage is an important public health measure, but some recent research suggests that workers exposed to sewage may be at increased risk for occupationally-acquired infection, notably with hepatitis viruses and Helicobacter pylori, a cause of peptic ulcer and stomach cancer. Tschopp et al1 address this concern with findings from a follow-up of Zurich municipal workers with and without exposure to sewage who participated in a previous cross-sectional study.2 The authors found no difference between exposed …

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