Identification of Gut Microbiome Biomarkers Associated to Acquisition of Enterobacteriae Highly Resistant to Third Generation Cephalosporines Following Ceftriaxone Treatment.

Patients receiving Ceftriaxone 1 gram or 2 grams per day during their presence in emergency unit of hospital whatever their medical condition, will be included. Rectal swabs will be collected at inclusion and at days 5 and 30 to perform analysis. Analysis will be performed to characterize gut microbiome in order to detect intestinal microbiome profiles significantly associated with protection against colonization by third generation cephalosporin resistant Enterobacteriae.