To effectively control an outbreak of ventilator-associated pneumonia (VAP) in a long-term care facility, which primary strategy should be implemented?

Rationale: A. Although chest physiotherapy can be helpful for selected clients with retained secretions, it is not recommended as a universal intervention for preventing VAP. There is limited evidence that routine chest physiotherapy alone reduces VAP rates, and it may increase discomfort or risk if not indicated. Therefore, it is not considered a primary or first-line preventive strategy during a VAP outbreak. B. Vitamin supplementation does not address the pathophysiology of ventilator-associated pneumonia, which primarily develops due to aspiration of colonized oral or gastric secretions into the lungs. While good nutrition supports overall immune function, vitamins alone do not prevent VAP and are not an effective outbreak-control measure. C. Elevating the head of the bed to 30–45 degrees is one of the most strongly supported evidence-based interventions for preventing ventilator-associated pneumonia. This positioning significantly reduces the risk of aspiration, which is a major contributor to VAP. When the client is supine, gastric contents and oropharyngeal secretions are more likely to enter the airway. Consistent head-of-bed elevation is a core component of VAP prevention bundles used across healthcare settings. D. Antibiotic stewardship is important to reduce antimicrobial resistance, but limiting antibiotics does not prevent the initial development of VAP. In the context of an outbreak, the priority is to implement interventions that directly reduce infection risk, such as positioning, oral care with chlorhexidine, proper suctioning, and ventilator bundle adherence.