From June 1997 to September 1998, in Binh dan hospital, we used no antibiotic in operations of 100 cases of scheduled groin hernias We routinely did per-operative wound cultures in all these patients and followed them up to 1 month for estimating the infections. Results: We had: - 2 cultures positive: 1 of Enterobacter, 1 of Staphylococcus.