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Table 2 Health protection agency definition of deep surgical site infection

From: The effect of triclosan coated sutures on rate of Surgical Site Infection after hip and knee replacement: a protocol for a double-blind randomised controlled trial

Deep incisional infection
SSI involving the deep tissues (i.e. fascial & muscle layers), within 30 days of surgery (or 1 year if an implant is in place) and the infection appears to be related to the surgical procedure & meets at least one of the following criteria:
1. Purulent drainage from deep incision (not organ space)
2. Organisms from culture and pus cells present in:
  Fluid/tissue from deep incision or wound swab from deep incision
3. Deep incision dehisces or deliberately opened and patient has at least 1 symptom of:
  Fever or localised pain/tenderness
4. Abscess or other evidence of infection in deep incision:
5. Clinicians diagnosis of deep incisional SSI
  1. Note: An infection involving both superficial and deep incisional.