Hi and welcome to our forum!Bacteria are microscopic single cell organisms, some of which can cause disease. If bacteria seed and proliferate during / after tummy tuck or BBL, one will develop a bacterial infection, which may result in scarring, tissue loss, disfigurement, or even death. These bacteria can be airborne or can come into direct contact with an open wound from a contaminated source.Protocols have developed over the years to minimize the risks of infection to include aseptic technique, clean enclosed environment, instrument sterilization, sterile draping, sterile gowning / gloving / head covering, air conditioning with laminar flow, etc. Wound cleansing with saline or antibiotic solution may be employed during the procedure.The use of prophylactic antibiotics immediately before and for 24 hours after surgery appears to reduce the incidence of infection. That being said, a serious infection is a rare event...Best wishes...