A nurse is caring for a 1-year-old child who has been hospitalized. Which of the following items in the child's room is a common source of health care-associated infection?

The correct answer is A: Bedside computer keyboard. Bedside computer keyboards are frequently touched by multiple healthcare providers without proper disinfection, leading to cross-contamination and potential healthcare-associated infections. Protective plastic gowns, unopened bottles of formula, and disposable diapers are not common sources of infection in the child's room as long as they are handled and disposed of properly. It is crucial to prioritize proper hygiene practices and regular cleaning of frequently touched surfaces like computer keyboards to prevent the spread of infections in healthcare settings.