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Table 2 CDC criteria for defining surgical site infection [4]

From: Scalpel blade contamination and risk of postoperative surgical site infection following abdominal incisions in dogs

 Superficial incisional SSIDeep incisional SSIOrgan/space SSI
TimingWithin 30 days of surgeryWithin 30 days of surgery or 1 year if implant in placeWithin 30 days of surgery or 1 year of implant in place
LocationOnly skin or subcutaneous tissues of incisionDeep soft tissues (fascia, muscle) of the incisionAny area other than the incision which was opened or manipulated in surgery
Clinical aspectsaPurulent discharge
Organisms isolated from an aseptically collected sample of fluid or tissue
One or more: pain/tenderness, localized swelling, redness, heat, and incision is deliberately opened by surgeon unless culture negative
Purulent drainage from deep incision but not organ/space
Deep incision spontaneously dehisces or is deliberately opened when patient has one or more: fever, localized pain/tenderness unless culture negative
Abscess or other evidence of infection on direct exam, during reoperative, or by histopathology or radiology
Purulent drainage from drain placed in organ/space
Organisms isolated from aseptically collected sample from organ/space
Abscess or other evidence of infection on direct exam, during reoperation or by histopathology or radiology
Diagnosis of organ/space SSI by attending clinician
  1. aOne or more must be present
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