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STI culture: an accurate method for detecting hidden infections
Bacteriological culture (bacteriological culture) for sexually transmitted infections (STIs) is the gold standard for identifying pathogens of urogenital infections. Unlike rapid or express tests, it is bacteriological culture that allows not only to detect the presence of pathogenic microorganisms, but also to check their sensitivity to antibiotics. This approach is especially important for prescribing effective treatment, avoiding relapses and the formation of antibiotic resistance.
When should you get tested for STIs?
If symptoms are present (discharge, itching, pain when urinating)
After unprotected sex
When preparing for pregnancy or during gestation
If infections are suspected that are not detected by PCR or ELISA (ureaplasma, gardnerella, mycoplasma)
If there are relapses after treatment
What does bacteriological culture show?
Type of pathogen: bacteria, fungi, opportunistic pathogens
Number of colonies: allows you to assess the intensity of the inflammatory process
Antibiotic test: sensitivity of the pathogen to basic antibacterial drugs
Research material
swab from the vagina, cervical canal, urethra
urine or ejaculate sample
in women, seeding from the posterior vaginal vault is possible
in men - prostate gland secretion
Advantages of the method
high sensitivity and specificity
accurate identification of the bacterial species
determination of antibiotic resistance
detection of mixed infections
Table: Comparison of STI diagnostic methods
| Method | What does it reveal? | Time to get the result | Sensitivity | Possibility of treatment selection |
|---|---|---|---|---|
| PCR | Pathogen DNA | 1–2 days | High | None |
| ELISA | Antibodies | 2–3 days | Medium | Indirectly |
| Back-sowing | Live bacteria | 5–7 days | High | Yes (antibiotic test) |
How to prepare for the analysis
Abstain from sexual intercourse for 48 hours before the test.
Do not use local antiseptics or suppositories.
Stop taking antibiotics 5–7 days before the test
Do not urinate for at least 2 hours before taking the swab (for men)
Target audience of the article
This material was created for:
sexually active people
women who are planning a pregnancy or are already pregnant
people who are tested for STIs after accidental exposure
couples with suspected urogenital infections
STI culture is a thorough and evidence-based diagnostic approach that provides the physician with an accurate picture of the infection and helps avoid treatment errors. It is advisable to combine it with other diagnostic methods for a complete clinical assessment.
