Healthcare-associated infections are infections that patients acquire during the course of receiving treatment for other conditions within a healthcare setting.
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Healthcare Associated Infections - Incidence Rate and Estimated Number of MRSA Infections in the U.S.
This measure is the incidence rate (per 100,000) and estimated number of Invasive Healthcare-Associated Methicillin-Resistant Staphylococcus aureus (MRSA) Infections in the U.S. Cases of healthcare-associated invasive MRSA infection are reported from each of nine Emerging Infection Program (EIP)/Active Bacterial Core Surveillance (ABC) Program sites. These sites represent nine geographically diverse metropolitan areas of the U.S., and serve as a sample of population-based surveillance data from which National Estimates of disease incidence can be calculated. Rates and national estimates are adjusted by age and race. For any single year, the value for “race” is unknown for about 15-18% of observations; for these observations the value for race is distributed proportionally based on the census distribution for each of the age stratum for each reporting region. Age and race specific incidence rates are determined among the EIP/ABCs sites, and extrapolations to the U.S. population are made by using annual census data and these EIP. For MRSA infections, incidence rates are reported (cases/100,000 in the population).
Inclusion Criteria: A case is a current resident of the Active Bacteria Core surveillance (ABCs) MRSA catchment area during the calendar years of 2005 though 2009, and who had a positive invasive culture reported to the Emerging Infections Program (EIP)/ABCs site. Healthcare-associated MRSA is defined as a patient who had any one or any combination of the following: an invasive MRSA culture collected 3 or more calendar days after the date of hospital admission, a hospitalization, surgery, dialysis treatment, or was a resident of a long-term care facility in the previous year before the date of initial culture, or the presence of a central vascular catheter around the time of hospital admission or initial culture.
Exclusion Criteria: A case that is not a current resident of the ABCs MRSA catchment area during the calendar year of 2005 through 2009, and who had a positive invasive MRSA culture. A patient who did not have any of the risk factors mentioned above.
This measure is calculated by the Division of Healthcare Quality Promotion, National Centers for Emerging and Zoonotic Infectious Diseases, CDC from the Active Bacterial Core/Emerging Infections Program.