OBJECTIVE To evaluate the value of serum PCT,CRP and IL-18 in the diagnosis of acute upper respiratory tract infections so as to provide reference for clinical treatment.METHODS Totally 143 children with acute upper respiratory tract infections admitted in our hospital from Apr.2011 to Apr.2012 were selected as the observation group,and healthy children conformed by physical examinations during the same period were selected as the control group.Serum PCT,CRP and IL-18 levels and contents were compared betwe...