National Nosocomial Infections Surveillance (NNIS) System Report, Data Summary from January 1990-May 1999, Issued June 1999,☆☆,,★★

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Adult and pediatric ICU surveillance component

Infection control professionals (ICPs) collect data on all sites of nosocomial infection in patients located in ICUs, as well as ICU-specific denominator data. Site-specific infection rates can be calculated by using as a denominator the number of patients at risk, patient-days, and days of indwelling urinary catheterization, central vascular cannulation (central line), or ventilation.

HRN surveillance component

ICPs collect data on all sites of nosocomial infection in patients located in HRN, as well as HRN-specific denominator data. Site-specific infection rates can be calculated by using as a denominator the number of patients at risk, patient-days, and days of umbilical catheter/central line use or ventilation for each of 4 birth weight categories (≤1000 g, 1001 to 1500 g, 1501 to 2500 g, and >2500 g).

Surgical patient surveillance component

ICPs select from the NNIS operative procedure list those procedures they wish to follow and monitor the patients undergoing those procedures for all infections or surgical site infections (SSI) only. A record on every patient undergoing the selected procedure is generated that includes information on risk factors for SSI such as wound class,11 duration of operation, and American Society of Anesthesiology (ASA) score.12 Using a composite index for predicting the risk of SSI after surgery, ICPs

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*See Appendix C.

AJIC Am J Infect Control 1999;27:520-32.

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