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Table 1 CDC surgical site infection criteria [25]

From: Wound infection following implant removal of foot, ankle, lower leg or patella; a protocol for a multicenter randomized controlled trial investigating the (cost-)effectiveness of 2 g of prophylactic cefazolin compared to placebo (WIFI-2 trial)

Superficial incisional SSI: Date of event for infection occurs within 30 days after the operative procedure (where day 1 = the procedure date) AND involves only skin and subcutaneous tissue of the incision AND patient has at least one of the following:
a Purulent drainage from the superficial incision
b Organisms identified from an aseptically-obtained specimen from the superficial incision or subcutaneous tissue by a culture or non-culture based microbiologic testing method
c Superficial incision that is deliberately opened by a surgeon, attending physician or other designee AND culture or non-culture based testing is not performed AND patient has at least one of the following signs or symptoms: pain or tenderness; localized swelling; erythema; or heat
d Diagnosis of a superficial incisional SSI by the surgeon or attending physician or other designee
Deep incisional SSI: Must meet the following criteria: The date of event for infection occurs within 90 days after the operative procedure (where day 1 = the procedure date) AND involves deep soft tissues of the incision (for example, fascial and muscle layers) AND patient has at least one of the following:
a Purulent drainage from the deep incision
b A deep incision that spontaneously dehisces, or is deliberately opened or aspirated by a surgeon, attending physician or other designee AND organism is identified by a culture or nonculture based microbiologic testing method; or culture or non-culture based microbiologic testing method is not performed AND patient has at least one of the following signs or symptoms: fever (> 38 °C); localized pain or tenderness. A culture or non-culture based test that has a negative finding does not meet this criterion
c An abscess or other evidence of infection involving the deep incision that is detected on gross
  Anatomical or histopathologic exam, or imaging test