MG an emerging sexually transmitted infection
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1 CATIE-News CATIE s bite-sized HIV and hepatitis C news bulletins. MG an emerging sexually transmitted infection 9 October 2013 The bacterium Mycoplasma genitalium (MG) is sexually transmitted and can cause inflammation of the urinary and genital tracts in men and women. This germ may also be linked to other problems, including some cases of arthritis and, in women, pelvic inflammatory disease and infertility. MG appears to be spread by unprotected anal or vaginal intercourse, as it can be detected in fluid samples from the penis, rectum and vagina. So far it has not been detected in fluid samples from the throat. MG, like other sexually transmitted infections (STIs), can cause inflammation of delicate genital tissue. Such inflammation can make the genitals more susceptible to infection with other STIs, including HIV. In high-income countries, overall rates of MG infection appear to be low, ranging between 1% and 3%. Several studies have found that rates of MG infection tend to be greater among people who seek care for STIs. Symptoms Urethritis is an inflammation of the tube (urethra) that carries urine out of the body. Common causes of urethritis are chlamydia and gonorrhea. However, testing of urine and other samples can fail to detect possible causes of urethritis. In such cases, and depending on the degree of distress caused by symptoms, some doctors may treat their patients with a presumed diagnosis of urethritis caused by MG and/or other STIs. In women, MG can cause inflammation of the urethra and cervix (cervicitis) and likely the uterus and the fallopian tubes. Symptoms of urethritis in men can include one or more of the following: frequent urination or the feeling of having to urinate frequently a burning sensation while urinating pain during intercourse or on ejaculation discharge from the penis Symptoms of cervicitis and urethritis in women can include one or more of the following: Testing abdominal pain vaginal pain frequent urination or the feeling of having to urinate frequently pain during intercourse a burning sensation while urinating discharge from the vagina abnormal vaginal bleeding after intercourse, after menopause, between periods MG is difficult to grow on a culture in the laboratory, meaning that many patients with an MG infection will have falsenegative results for their culture. Some labs may have access to specialized tests that can multiply and then detect the genetic material or DNA of MG. Such tests are called nucleic acid amplification tests (NAAT).
2 Distribution by gender MG in men Here are several studies that sought to assess the incidence (new cases, usually with symptoms) and prevalence (existing cases) of MG among men in high-income countries: London, UK In a study with 438 men who have sex with men (MSM), researchers found that about 7% had MG. HIV-positive MSM were significantly more likely (nearly eight-fold) to have MG infection compared to HIV-negative MSM. Among HIV-positive men, MG was more common than the bacteria that cause gonorrhea and chlamydia. Oslo, Norway Researchers tested fluid samples from the anus/rectum, penis and throat of 1,778 MSM. They found that 5% had MG; in 70% of these men, it was found in samples taken from the anus/rectum. Sydney, Australia In a study of 1,182 men, 8% tested positive for MG. New Orleans, U.S. In a study of people who visited a sexual health clinic, researchers found the following rates of MG infection among men who tested negative for chlamydia and gonorrhea: 25% of 97 men with urinary tract symptoms 7% of 184 men without urinary tract symptoms At the same clinic, 35% of men who were co-infected with chlamydia and who had urinary tract symptoms also had MG co-infection. Among those with urinary tract symptoms due to gonorrhea, 14% were co-infected with MG. Distribution by gender MG in women Here are several studies that sought to assess the incidence (new cases, usually with symptoms) and prevalence (existing cases) of MG among women in high-income countries: Melbourne, Australia In this study of 1,110 women aged 16 to 25 years, only 1.3% had detectable MG. Sydney, Australia In this study of 527 women, 4% had MG. Chapel Hill, U.S. In a study done in North Carolina with 381 women, MG was found in nearly 20%. Malmo, Sweden In this study of 5,519 tested women, only 2% had MG. London, UK In a study of 2,378 young women, researchers found that about 3% had MG. Treatment options Regimens for the treatment of MG can vary depending on the region or medical centre and the severity of the
3 disease. In clinical trials comparing the antibiotics azithromycin and doxycycline, azithromycin resulted in more cures. However, those trials were done several years ago and since then MG may have acquired more tolerance and even resistance to azithromycin. Based on reports and clinical trials, there are at least two possible regimens of azithromycin that doctors can consider, as follows: azithromycin single treatment one dose of 1 gram taken orally azithromycin extended treatment 500 mg on the first day followed by 250 mg per day for the next four days Unfortunately, these two regimens have not been compared against each other in clinical trials so doctors are not certain if one is better than the other. There is also a 2 gram extended-release formulation of azithromycin (sold as Zmax SR by Pfizer). However, no data on the effectiveness of this dose on MG has been reported. Increasingly, there have been reports of treatment failure when a single 1 gram dose of azithromycin is used in MG infection. In such cases, some STI experts suggest the use of another antibiotic, moxifloxacin (Avelox), given as 400 mg once daily for between seven to 10 days. However, it is important to note that reports of MG resistant to both azithromycin and moxifloxacin have been documented. Our next CATIE News bulletin will focus on antibiotic resistance by MG and a possible emerging therapy. Acknowledgement We thank Marc Steben MD, Institut national de santé publique du Québec, for his helpful discussion, research assistance and expert review. Resource STIs: What role do they play in HIV transmission? Prevention in Focus REFERENCES: 1. Taylor-Robinson D, Jensen JS. Mycoplasma genitalium: from Chrysalis to multicolored butterfly. Clinical Microbiology Reviews Jul;24(3): Sean R. Hosein 2. Cazanave C, Manhart LE, Bébéar C. Mycoplasma genitalium, an emerging sexually transmitted pathogen. Médecine et maladies infectieuses Sep;42(9): Chrisment D, Machelart I, Wirth G, et al. Reactive arthritis associated with Mycoplasma genitalium urethritis. Diagnostic Microbiology and Infectious Disease. 2013; in press. 4. Chrisment D, Charron A, Cazanave C, et al. Detection of macrolide resistance in Mycoplasma genitalium in France. Journal of Antimicrobial Chemotherapy Nov;67(11): Hamasuna R. Mycoplasma genitalium in male urethritis: diagnosis and treatment in Japan. International Journal of Urology Jul;20(7): Reinton N, Moi H, Olsen AO, et al. Anatomic distribution of Neisseria gonorrhoeae, Chlamydia trachomatis and Mycoplasma genitalium infections in men who have sex with men. Sexual Health Jul;10(3): McGowin CL, Annan RS, Quayle AJ et al. Persistent Mycoplasma genitalium infection of human endocervical epithelial cells elicits chronic inflammatory cytokine secretion. Infection and Immunity Nov;80(11): Gatski M, Martin DH, Theall K, et al. Mycoplasma genitalium infection among HIV-positive women: prevalence, risk factors and association with vaginal shedding. International Journal of STD and AIDS Mar;22(3): Moi H, Reinton N, Moghaddam A. Mycoplasma genitalium in women with lower genital tract inflammation. Sexually Transmitted Infections Feb;85(1): Gillespie CW, Manhart LE, Lowens MS, et al. Asymptomatic urethritis is common and is associated with characteristics that suggest sexually transmitted etiology. Sexually Transmitted Diseases Mar;40(3): Mena LA, Mroczkowski TF, Nsuami M, et al. A randomized comparison of azithromycin and doxycycline for the
4 treatment of Mycoplasma genitalium-positive urethritis in men. Clinical Infectious Diseases Jun 15;48(12): Bradshaw CS, Chen MY, Fairley CK. Persistence of Mycoplasma genitalium following azithromycin therapy. PLoS One. 2008;3(11):e Mobley VL, Hobbs MM, Lau K, et al. Mycoplasma genitalium infection in women attending a sexually transmitted infection clinic: diagnostic specimen type, coinfections, and predictors. Sexually Transmitted Diseases Sep;39(9): Seña AC, Lensing S, Rompalo A, et al. Chlamydia trachomatis, Mycoplasma genitalium, and Trichomonas vaginalis infections in men with nongonococcal urethritis: predictors and persistence after therapy. Journal of Infectious Diseases Aug 1;206(3): Oakeshott P, Aghaizu A, Hay P, et al. Is Mycoplasma genitalium in women the New Chlamydia? A communitybased prospective cohort study. Clinical Infectious Diseases Nov 15;51(10): Manhart LE, Gillespie CW, Lowens MS, et al. Standard treatment regimens for nongonococcal urethritis have similar but declining cure rates: a randomized controlled trial. Clinical Infectious Diseases Apr;56(7): Short VL, Totten PA, Ness RB, et al. Clinical presentation of Mycoplasma genitalium infection versus Neisseria gonorrhoeae infection among women with pelvic inflammatory disease. Clinical Infectious Diseases Jan 1;48(1): Edlund M, Blaxhult A, Bratt G. The spread of Mycoplasma genitalium among men who have sex with men. International Journal of STD and AIDS Jun;23(6): Cazanave C, Lawson-Ayayi S, Hessamfar M, et al. Prevalence of Mycoplasma genitalium among HIV-infected women, Agence Nationale de Recherches sur le SIDA et les hépatites virales CO3 Aquitaine Cohort, France. Sexually Transmitted Infections Aug;40(8): Couldwell DL, Tagg KA, Jeoffreys NJ, et al. Failure of moxifloxacin treatment in Mycoplasma genitalium infections due to macrolide and fluoroquinolone resistance. International Journal of STD and AIDS Oct;24(10): Anagrius C, Loré B, Jensen JS. Treatment of Mycoplasma genitalium. Observations from a Swedish STD clinic. PLoS One Apr 8;8(4):e61481.
5 Produced By: 555 Richmond Street West, Suite 505, Box 1104 Toronto, Ontario M5V 3B1 Canada Phone: Toll-free: Fax: Charitable registration number: RR Disclaimer Decisions about particular medical treatments should always be made in consultation with a qualified medical practitioner knowledgeable about HIV- and hepatitis C-related illness and the treatments in question. CATIE provides information resources to help people living with HIV and/or hepatitis C who wish to manage their own health care in partnership with their care providers. Information accessed through or published or provided by CATIE, however, is not to be considered medical advice. We do not recommend or advocate particular treatments and we urge users to consult as broad a range of sources as possible. We strongly urge users to consult with a qualified medical practitioner prior to undertaking any decision, use or action of a medical nature. CATIE endeavours to provide the most up-to-date and accurate information at the time of publication. However, information changes and users are encouraged to ensure they have the most current information. Users relying solely on this information do so entirely at their own risk. Neither CATIE nor any of its partners or funders, nor any of their employees, directors, officers or volunteers may be held liable for damages of any kind that may result from the use or misuse of any such information. Any opinions expressed herein or in any article or publication accessed or published or provided by CATIE may not reflect the policies or opinions of CATIE or any partners or funders. Information on safer drug use is presented as a public health service to help people make healthier choices to reduce the spread of HIV, viral hepatitis and other infections. It is not intended to encourage or promote the use or possession of illegal drugs. Permission to Reproduce This document is copyrighted. It may be reprinted and distributed in its entirety for non-commercial purposes without prior permission, but permission must be obtained to edit its content. The following credit must appear on any reprint: This information was provided by CATIE (the Canadian AIDS Treatment Information Exchange). For more information, contact CATIE at CATIE Production of this content has been made possible through a financial contribution from the Public Health Agency of Canada. Available online at:
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