How is the infection rate calculated?

The calculation of the infection rate is accurately represented by taking the number of infections that have occurred and dividing that by the total number of resident-days at risk, then multiplying by a constant, K, to express the rate in a standardized format. Resident-days at risk accounts for the total time individuals are vulnerable to infections, combining both the number of residents and the duration of their stay in the facility.

This method allows for a more precise understanding of the infection spread relative to the population at risk. It normalizes the data, which is essential for effective comparison across different time periods and settings. Thus, B correctly represents how infection rates are typically calculated in a nursing home or similar healthcare settings, providing a clear metric for monitoring and improving infection control measures.