The study involves randomly assigning adults experiencing surgery in different hospitals to preoperative skin preparation with either CHA scrub or PI scrub and paint. The primary outcome is any sign of infection within 30 days after surgery. Secondary outcomes include the individual types of infection (superficial incisional infection, deep incisional infection, or organ-space infection). Quantitative research method will be used for this clinical topic and the measurement method will be collecting the secondary data such as literature research, patient medical records, patient satisfaction surveys, hospital reports or governmental database on SSIs. This data can reveal important relationships and offer a good way to retrieve data efficiently
