Urinary tract infections are among the most recurrent in human beings. They are caused by a wide variety of usual uropathogens, although they may be caused by some fastidious micro-organisms, such as Gardnerella vaginalis. It is a facultative anaerobe, found in the form of Gram-variable coccobacilli. It inhabits the vaginal mucosa and occasionally may cause urinary tract infections. The isolation may be performed on urine samples using CNA agar, incubated for 48-72 hours in atmosphere rich in CO2. The Gram examination of non-centrifuged urine may aid the microbiologist in identifying samples in which a fastidious bacterium is the causative agent, since the visualization of numerous epithelial cells, the absence of leukocytes and the presence of more than one morphological type suggest sample contamination. As studies show the Gardnerella vaginalis incidence among the causative agents of urinary tract infections, the isolation in urine cultures can not be overlooked. The clinical interpretation of the Gardnerella vaginalis growth is difficult to assess, thus being essential the information exchange between the clinical microbiology laboratory and medical staff in order to investigate the presence of signs and symptoms that may be associated with urinary tract infections.
Gardnerella vaginalis; Urinary tract infections; Fastidious bacteria