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Encouraging frequent handwashing is essential for infection control in a nursing home because it is one of the simplest and most effective ways to prevent the spread of infections. Handwashing removes dirt, viruses, and bacteria from the hands, which are primary agents in the transmission of infections, especially in healthcare settings where vulnerable populations reside. By promoting hand hygiene among staff, residents, and visitors, the risk of cross-contamination and the spread of pathogens can be significantly reduced, promoting a healthier environment for everyone.

Other options, while they may have their benefits in specific contexts, do not focus as directly on the fundamental practice of infection prevention. For instance, providing shared utensils could increase the risk of spreading infections, as could keeping doors open if it leads to greater exposure to external pathogens. Limiting visitor access can help control the number of potential carriers of infections, but it does not replace the necessity of maintaining robust hygiene practices. Thus, frequent handwashing remains the cornerstone of effective infection control in nursing homes.