“SIRS can be incited by ischemia, inflammation, trauma, infection or a combination of several “insults”. SIRS is not always associated with infection. While not universally accepted, some have proposed the terms “severe SIRS” and “SIRS shock” to describe serious clinical syndromes that are not infectious in nature and thus cannot be labeled according to the various sepsis definitions”

Steven D. Burdette M.D. (Infectious Disease Medicine M.D.– Wright State Physicians in Dayton, Ohio – http://www.healthgrades.com/physician/dr-steven-burdette-yhfgy)