Patients found to have acute uncomplicated appendicitis at appendectomy will be randomized to either single dose of perioperative antibiotics /On the second post-operative day the patient who has no fever and tolerating a regular diet, will be discharged home without oral antibiotics. On the post-operative, day seven after surgery all patients will be examined in the outpatient clinic on the presence of surgical site infection. then will be followed for a 30 days after surgery .