Vancomycin-resistant enterococci (VRE) are a type of enterococci bacteria resistant to antibiotics especially vancomycin. Enterococci bacteria typically do not cause problems in healthy people but may cause infections (sometimes serious infections) to patients with weakened immune system in body sites such as the intestines, the urinary tract, and wounds. Because of the increasing resistance to antibiotics, VRE infections are much more difficult to treat than other enterococci infections and are becoming a major type of healthcare-associated infections.