EIP Areas: California (3 county San Francisco Bay area); Connecticut; Georgia (8 county Atlanta area); Minnesota (2 metro Twin City counties); New York (1 Rochester county); Tennessee (1 Nashville county). Note: The population under surveillance changed from 2014; it was reduced by 10 counties located in 3 states. Population: The surveillance areas represent 14,402,040 persons Case Definition: Invasive methicillin-resistant Staphylococcus aureus (MRSA) disease: isolation of MRSA from a normally sterile site in a resident of the surveillance area in 2015. Cases of disease are classified into one of three epidemiologic classifications. A case is classified as hospital-onset (HO) if the MRSA culture was obtained on or after the fourth calendar day of hospitalization, where admission is hospital day 1; as healthcare-associated community- onset (HACO) if the culture was obtained in an outpatient setting or before the fourth calendar day of hospitalization and had one or more of the following: 1) a history of hospitalization, surgery, dialysis, or residence in a long term care facility in the previous year, or 2) the presence of a central vascular catheter (CVC) within 2 days prior to MRSA culture; and as community-associated (CA) if none of the previously mentioned criteria are met. 2015-mrsa-report.pdf

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