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Published on: August 15, 2025
Molecular epidemiology of selected sexually transmitted infections
Hamid Jalal1, Andrew Delaney, Neil Bentley
1Clinical Microbiology & Public Health Laboratory, Box 236, Addenbrooke's Hospital Hills Road, Cambridge, UK.
Abstract:
Neisseria gonorrhoeae (NG), Chlamydia trachomatis (CT), Trichomonas vaginalis (TV) and Mycoplasma genitalium (MG) are established pathogens for human genital tract. However, the role of Ureaplasma urealyticum (UU) and Ureaplasma parvum (UP) in genital pathology is poorly unerstood. A prospective study to investigate the prevalence of above infections was performed on a cohort of 1,718 consecutive patients attending a Genitourinary Medicine (GUM) clinic. A previously published in-house real-time PCR assay, for the detection of CT DNA in genital swabs, was modified for this study. Two amplification reactions detected the DNAs of TV, NG, MG, CT, UU and UP in genital swabs from 4 (0.2%), 11 (0.6%), 17 (1%), 129 (8%), 282 (16%) and 636 (37%) patients, respectively. 594 (70%) of 848 women and 333 (38%) of 870 men were infected with at least one type of microorganism. Among 594 infected females, 485 (82%) had a single infection, 97 (16%) had a double infection, and 12 (2%) had a triple infection. Of the 333 infected men, 304 (91%) had a single infection, 27 (8%) had a double infection, and 2 (1%) had a triple infection. The prevalence of infection in both genders decreased with increasing age. The prevalence proportion of UP was significantly higher in women (54%) compared with men (18%). The high prevalence of UU and UP suggests that these bacteria are commensals of genital tract.
Insights
Ureaplasma parvum (UP) and Ureaplasma urealyticum (UU) are common in the genital tract, with UP more prevalent in women. Their high prevalence suggests they may be commensals rather than pathogens.
Area of Science:
- Microbiology
- Infectious Diseases
- Genitourinary Medicine
Background:
- Neisseria gonorrhoeae (NG), Chlamydia trachomatis (CT), Trichomonas vaginalis (TV), and Mycoplasma genitalium (MG) are known genital pathogens.
- The role of Ureaplasma urealyticum (UU) and Ureaplasma parvum (UP) in genital pathology remains unclear.
Purpose of the Study:
- To investigate the prevalence of common genital infections including UU and UP.
- To compare the prevalence of these infections between genders and across age groups.
Main Methods:
- A prospective study of 1,718 patients attending a Genitourinary Medicine (GUM) clinic.
- Real-time PCR assay modified for simultaneous detection of TV, NG, MG, CT, UU, and UP DNA in genital swabs.
Main Results:
- Ureaplasma parvum (UP) was detected in 37% and Ureaplasma urealyticum (UU) in 16% of patients.
- Infections were more prevalent in women (70%) than men (38%), and decreased with age.
- UP prevalence was significantly higher in women (54%) than men (18%).
Conclusions:
- The high prevalence of UU and UP suggests they may act as commensals in the genital tract.
- Further research is needed to elucidate the specific role of UU and UP in genital pathology.
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