This study have aim to identify the bacteria causing infection and antimicrobial susceptibility in organ transplant patients at the Hospital Guillermo Almenara, in the city of Lima. Samples were evaluated for transplant patients consisting of urine, catheter, wound secretion, blood, endotracheal aspirate and intraabdominal abscess. Technique was used on primary isolation plate; also blood culture was used for system Versa TREK, Walk Away MicroScan system 96 was used for bacterial identification and to the antimicrobial susceptibility by the Kirby Bauer method. We found 58.4% of bacterial infection, predominant of the urinary tract, the most common bacteria Escherichia coli was 44.7%. In gram-negative bacteria maintaining sensitivity to amikacin, imipenem and meropenem, but moderate to high resistance in the rest of antimicrobials. In gram-positive bacteria, found good sensitivity to the ...