The presence of abnormal vaginal discharge from is one of the most common reasons for patients to report to the gynecologist in outpatient care. However, many infections, both bacterial and viral remain asymptomatic, colonizing the vagina and cervix for a long period leads to a number of abnormalities, including infertility. Inflammation of the vagina or the cervix is one of the risk factors of premature birth, and therefore appears to be purposeful to perform bacteriolo-gical culture from the cervix during pregnancy, to exclude infection. There are many techniques for identifying the microorganism – easily available and low cost method of Gram staining or complicated and costly to identify viruses. In the Mazowieckie region during a screening test for pregnant women Streptococcus group B were found in 19.7% of women. This led Polish Gynecological Society to create guidelines for the detection of the bacteria and prevent infections of newborns.