This is a pilote monocentric prospective study about pediatric peritonitis and antibiotics pharmacokinetic and pharmacodynamic. The investigators will include 41 patients between 3 and 17 years-old during 2 years in the University Hospital of Nancy. The aim of this study is to determine if the beta-lactam dosages in children recommended by the guidelines for management of intra-abdominal infections permitted the achievement of adequatly serum and peritoneal concentrations in the medical and surgical management of peritonitis. The investigators will collected serum and peritoneal fluid samples at 3 different times: peritoneal incision, end of surgery, 2 days and 5 days after surgery in order to compare the concentrations and the minimal inhibitor concentration of bacteria. The hypothesis is that of a serum and peritoneal antibiotic under dosage.
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antibiotic concentration
Timeframe: Peritoneal incision, end of surgery, Day+5 after surgery if systemic peritonitis,
antibiotic concentration
Timeframe: During surgery, Day+2 after surgery if drain peritonal, Day+5 after surgery if systemic peritonitis,