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Two studies raise concerns about the increased prevalence of multidrug-resistant bacteria in community-based settings. The first study consisted of population-based surveillance of invasive methicillin-resistant Staphylococcus aureus (MRSA) infections in nine U.S. communities in 2005, with “invasive” defined as isolation of MRSA from a normally sterile body site (e.g., blood, spinal fluid, bone). The 8987 cases were categorized as healthcare-associated with community onset (e.g., presence of invasive device at hospital admission, or a hospitalization, surgery, or residence in a long-term care facility in the previous 12 months), healthcare-associated with hospital onset, or community-associated. The proportions of cases in these three categ…