Nine hundred and thirty one urine's specimens of patients affected by urinary infection have been studied by pathology practising in different towns in France. The most frequently germs retrieved are: Escherichia coli 76%, Proteus mirabilis 12%, Klebsiella 5%, Staphylococcus epidermidis 2%. Were studied Gram negative rods sensibility to ampicillin (A), cephalosporin 1st generation (C), nalidixic acid (Nal), gentamicin (G), norfloxacin (Norf); Gram positive cocci resistance to oxacillin (Oxa), erythromycin (E), pristinamycin (P), gentamicin (G), norfloxacin (Norf). For E. coli: the resistance was 24% A, 2% C1, 0.1% G, 4% Nal, 0.1% Norf. For Klebsiella: the resistance was respectively 96% A, 12% C1, 10% Nal, 18% G., 4% Norf. For P. mirabilis: 11% A, 3% C1, 0% Nal, 9% G, 0% Norf. E. coli strains cephalo R; Gram negative rods Genta R or quinolone R; staphylocoque oxa R or pristina R have been checked by HIA Begin microbiology laboratory. Discrepancies in results have been analysed. This study enabled the participants to improve their bacteriological technic, antibiogramm's reading, results' interpretation.