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Updated: Jul 24, 2026

Optimized PCR-based Detection of Mycoplasma
Published on: June 20, 2011
Mycoplasma genitalium in the cervices of Japanese women
Background:
Mycoplasma genitalium is considered a cause of nongonococcal urethritis in men. This organism also is a cause of genital infections in women, and has been detected in women attending sexually transmitted disease clinics in the United Kingdom and Denmark, although its prevalence is unknown in Japanese women.
Goals:
To determine the prevalence of M. genitalium in the cervices of women with cervicitis or adnexitis as well as in asymptomatic pregnant women in Japan.
Study Design:
Two hundred women who attended obstetric and gynecologic clinics were recruited. Sixty-four women had cervicitis, 53 had adnexitis, and 3 had both. Eighty pregnant women were asymptomatic for infection. Cervical swab specimens were examined for M. genitalium using a polymerase chain reaction-based assay.
Results:
Five (7.8%) of 64 women with cervicitis and 3 (5.7%) of 53 women with adnexitis were positive for M. genitalium. After exclusion of Chlamydia-positive women, 5 (8.8%) of 57 women with cervicitis, and 2 (4.1%) of 49 women with adnexitis were positive for M. genitalium. In none of 80 asymptomatic pregnant women, including a Chlamydia-positive woman, was M. genitalium detected. Overall, 7 (6.6%) of 106 women with Chlamydia-negative genital infections were positive for the M. genitalium. This prevalence was significantly greater than that in asymptomatic pregnant women (P < 0.05).
Conclusions:
A significantly greater prevalence of M. genitalium was demonstrated in Japanese women with Chlamydia-negative cervicitis or adnexitis, compared with that in asymptomatic pregnant women. This study suggests that M. genitalium may play a pathogenic role in a portion of cases with Chlamydia-negative genital infections.
Insights
Mycoplasma genitalium is a cause of genital infections in women. This study found it in Japanese women with cervicitis or adnexitis, but not in asymptomatic pregnant women.
Area of Science:
- Reproductive Health
- Infectious Diseases
- Microbiology
Background:
- Mycoplasma genitalium is a known cause of nongonococcal urethritis in men.
- It is also implicated in genital infections in women, with prevalence data lacking for Japanese populations.
- Previous detection in UK and Danish STD clinics highlights its relevance.
Purpose of the Study:
- To determine the prevalence of Mycoplasma genitalium in Japanese women.
- Specifically focusing on women with cervicitis or adnexitis, and comparing this to asymptomatic pregnant women.
Main Methods:
- Recruited 200 women from obstetric and gynecologic clinics.
- Collected cervical swab specimens for Mycoplasma genitalium detection.
- Utilized a polymerase chain reaction (PCR)-based assay for pathogen identification.
Main Results:
- Mycoplasma genitalium was detected in 7.8% of women with cervicitis and 5.7% with adnexitis.
- After excluding Chlamydia co-infections, prevalence was 8.8% for cervicitis and 4.1% for adnexitis.
- No Mycoplasma genitalium was detected in 80 asymptomatic pregnant women.
Conclusions:
- Mycoplasma genitalium prevalence was significantly higher in Japanese women with Chlamydia-negative cervicitis or adnexitis compared to asymptomatic pregnant women.
- These findings suggest Mycoplasma genitalium may contribute to a subset of Chlamydia-negative genital infections.
- Further research into its pathogenic role in specific gynecological conditions is warranted.
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