Which action is the most effective way to prevent hospital-acquired infections (HAI)?

Choice A reason: Hand hygiene is universally recognized by the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO) as the single most effective intervention in preventing the transmission of healthcare-associated infections. It disrupts the chain of infection by removing transient microorganisms from the hands of healthcare workers, thereby preventing the cross-contamination of pathogens between different patients and the healthcare environment. Choice B reason: Limiting visitors during hospitalization may reduce the introduction of community-acquired pathogens into the facility, but it does not address the primary vector of hospital-acquired infections, which is the healthcare worker. Most HAIs are transmitted via the hands of staff moving between patients. Therefore, visitor restriction is a secondary measure and far less effective than rigorous clinical hand hygiene protocols. Choice C reason: Wearing gloves at all times is an inappropriate use of personal protective equipment (PPE) and can actually facilitate the spread of infection if they are not changed between tasks or patients. Gloves are not a substitute for hand hygiene; pathogens can contaminate the outside of the glove and be transferred just as easily as via bare skin. Prolonged glove use also compromises skin integrity and promotes microbial growth. Choice D reason: Keeping patients NPO (nothing by mouth) before procedures is a safety measure intended to prevent pulmonary aspiration of gastric contents during anesthesia. While it is a critical preoperative protocol, it has no direct clinical relationship to the prevention of systemic hospital-acquired infections or the control of horizontal transmission of multidrug-resistant organisms within a medical-surgical unit.