Giardia lamblia and Helicobacter pylori coinfection in gastrointestinal biopsies: A retrospective single-center analysis from Switzerland

•For Switzerland, data on G. lamblia and H. pylori coinfection are scarce.•In our series, G. lamblia was found in ≈1 of 700 small intestine biopsies.•Likewise, ≈1 of 7 gastric biopsies harbored H. pylori-associated gastritis.•Coinfection was common and was seen in ≈4 of 10 G. lamblia positive cases.•Gastroenterologists and pathologists should be aware of this in daily practice.