Fig. 3.

Percentage of observed carriers identified by screening high-risk patients selected using different methods. For each observed MRSA carrier, we use different approaches to estimate the colonization risk of all patients present in hospital during the week of confirmation and rank patients according to the estimated colonization risk (from high to low). We screen the top-ranked patients selected by each approach and calculate the percentage of identified carriers among all confirmed cases. Results are compared for the SILI algorithm, free simulation, length of stay, total number of contacts, contact tracing, and multivariate logistic regression. Only 25% of confirmed cases can be reached through contact tracing, as others have no direct contact with other observed cases.