Aerococcus Urinae In Urinary Tract Infection

BACKGROUND AND OBJECTIVESThere are three described species of the genus Aerococcus: A. Viridans, A.Urinae and A. Christensenii. A. Christensenii has not been reported as a human pathogen. A.Urinae indicate that it is associated with UTI, Bacteremia and Endocarditds. Most patients infected with A.Urinae are elderly males with predisposing conditions who present initially with UTI. We report one case of urinary tract infection caused by A.Urinae and characterize this isolate by morphology , biochemical testing and Antibiotic susceptibilities.MATERIALS AND METHODSA ۴۲ years old male with history of diabetes mellitus presented at the Noor clinical laboratory with several days of dysuria, increased urinary frequency and nectoria. Urin analysis revealed many WBC/ HPF, many bacteria and negative result for nitrities. The urine culture grew > ۱۰۵ cfu/ml of A.Urinae the only isolates.RESULTS AND DISCUSSIONThe laboratory Diagnosis of A.Urinae can be difficult. The presumptive identification of aerobic gram positive, alpha- hemolytic cocci and the decision on wheter to more fully identify the isolates based on gram stain, colony appearance and catalase reaction. Because A.Urinae is catalase negative, it could be mistaken for alpha- hemolytic streptococci or enterococci that are more common urine isolates. A gram stain should be carefuly examined for the characteristic arrangement in clusters and tetrads to rule out streptococci. The most important routine tests are hydrolysis of hippurate, PYR and Antibiotic susceptibility test. This important to consider A.Urinae as a potential pathogen , because when A.Urinae was not recognized or correct antibiotic treatment was delayed simple UTI progressed to systemic infection including endocarditis and sepsis.

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Aerococcus Urinae ، Urinary Tract Infection