الفهرس 
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Abstract
An infection is considered to be a surgical site infection (SSI) when it occurs at the site of surgery within 30 days of an operation or within 1 year of an operation if a foreign body (e.g., total hip prothesis) is implanted as part of the surgery. In order to carry out surveillance, prevention and control of surgical site infections (SSI) properly, it is necessary to utilize a commonly employed set of definitions.The CDC’s National Healthcare Surveillance Network has developed standardized criteria for defining an SSI. SSIs are classified as either incisional or organ/ space. Incisional SSIs are further classified into superficial (involving only skin or subcutaneous tissue of the incision) or deep (involving fascia and/or muscular layers). Organ/space SSIs include infections in a tissue deep to the fascia that was opened or manipulated during surgery.No single routinely used test is sufficiently accurate to diagnose infection. Therefore, a combination of clinical, laboratory, histopathology, microbiology, and imaging studies is usually required.SSI is suspected when there is erythema, drainage or fluctuance of the surgical incision, in the absence or presence of systemic signs of infection such as fever or Leukocytosis. Local signs of infection are usually apparent with superficial and deep SSI, although systemic signs are somewhat variable. In contrast, the presence of systemic signs of infection in the absence of local signs may indicate an organ / space infection or an infection originating from a source other than the surgical site.