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Query: UMLS:C0026936 (Mycoplasma)
 14,761 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Bacterial vaginosis (BV) has been associated with HIV sexual transmission and increased levels of genital tract HIV RNA. We postulated that BV induces the appearance of substances in the genital tract that stimulate HIV expression locally. To test this, we measured HIV RNA levels in genital mucosal fluid from women with or without BV (defined by Nugent score) and compared them with the ability of those fluids to stimulate HIV expression in the chronically HIV-infected monocytic line U1. The U1 activity was significantly higher in women with BV (median = 1320 pg/ml p24) than in women with normal flora (median = 103 pg/ml p24, p = 0.0001). However, levels of the U1 activity were not significantly associated with levels in the genital tract of HIV RNA. Levels of the U1 activity were also not associated with levels of Gardnerella vaginalis or Mycoplasma hominis in genital fluids, suggesting these bacteria were not the source of the activity. Thus, while these data show a strong association of U1 stimulatory activity with BV, no influence of the U1 activity on genital tract HIV expression was observed.
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PMID:Relationship of U1 cell HIV-stimulatory activity to bacterial vaginosis and HIV genital tract virus load. 1638 11

Mycoplasma genitalium is an opportunistic pathogen of the genital tract. It has been implicated as an etiological agent of urethritis in men and cervicitis and pelvic inflammatory disease (PID) in women. The aim of this study was to determine the prevalence of Mycoplasma genitalium in male urethritis and in vaginal specimens of pregnant women. Urethral specimens obtained from 37 men presenting with urethritis and vaginal specimens from 50 consecutive pregnant women were tested for the presence of M. genitalium by polymerase chain reaction (PCR). The urethral specimens were also examined for the presence of Neisseria gonorrhoeae, Chlamydia trachomatis and Ureaplasma sp whereas the vaginal microbiota and the presence of genital mycoplasma were investigated in the vaginal specimens. Twenty three cases were classified as nongonococcal urethritis (NGU) and 14 as gonorrheal disease. M. genitalium was detected in 3 of 23 (13.04%) men with NGU; in two cases with Ureaplasma sp, and in one patient as the unique agent. C. trachomatis was found in 7 patients with NGU and in one patient with gonorrhea. Ureaplasma sp was isolated in 13 (35.1%) patients, 8 cases of NGU and in 5 patients with gonorrhea. The organism was also detected in 6 (15%) of 40 women; in 5 cases in the presence of a normal microbiota (Nugent score 0-3), and an in one case in the presence of bacterial vaginosis. Ureaplasma spp was isolated in the 6 positive specimens. This study indicates that M. genitalium can be detected in urethral specimens of some cases of NGU as well as in the lower genital tract of pregnant women in the presence of a normal vaginal microbiota.
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PMID:[Molecular detection of Mycoplasma genitalium in men and pregnant women]. 1646 59

In dependence on health of women the female genital tract is colonised by different microorganisms. Mycoplasma hominis was the first mycoplasma of human origin to be isolated. M. hominis, a common inhabitant of the vagina of healthy women, becomes pathogenic once it invades the internal genital organs. M. hominis is associated with bacterial vaginosis but it is still unclear whether the organism really contributes to a pathological process in which so many different bacteria are involved. The aim of this article is to summarize known information about these microorganisms.
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PMID:[Mycoplasma hominis in female genital tract]. 1692 60

Preterm birth represents a major problem for modern obstetrics due to its increasing frequency and the accompanying socioeconomic impact. Although several maternal characteristics related to preterm birth have been identified, the etiology in most cases remains inadequately understood. Various microorganisms have been linked to the pathogenesis of preterm birth. Microbes may reach the amniotic cavity and fetus by ascending from the vagina and cervix, by hematogenous distribution through the placenta, by migration from the abdominal cavity through the fallopian tubes, or through invasive medical procedures. Organisms commonly cultured from the amniotic cavity following preterm delivery include Ureaplasma urealyticum, Mycoplasma hominis, Bacteroides spp., Gardnerella vaginalis, Neisseria gonorrhoeae, Chlamydia trachomatis, Trichomonas vaginalis, and group B hemolytic streptococci. Several trials have examined the effect of antibiotic administration to patients with preterm labor and intact membranes, preterm premature rupture of the membranes, genital mycoplasmal infection, asymptomatic bacteriuria, and bacterial vaginosis. The results of such studies, which were variable and often conflicting, are discussed here.
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PMID:Preterm birth due to maternal infection: Causative pathogens and modes of prevention. 1695 71

Bacterial vaginosis (BV) is particularly common in black women, and in Nigeria it is often caused by Mycoplasma, as well as Atopobium, Prevotella and Gardnerella sp. Antimicrobial metronidazole oral therapy is poorly effective in eradicating the condition and restoring the Lactobacillus microbiota in the vagina. In this study, 40 women diagnosed with BV by discharge, fishy odor, sialidase positive test and Nugent Gram stain scoring, were randomized to receive either two dried capsules containing Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14 each night for 5 days, or 0.75% metronidazole gel, applied vaginally twice a day (in the morning and evening). Follow-up at day 6, 15 and 30 showed cure of BV in significantly more probiotic treated subjects (16, 17 and 18/20, respectively) compared to metronidazole treatment (9, 9 and 11/20: P=0.016 at day 6, P=0.002 at day 15 and P=0.056 at day 30). This is the first report of an effective (90%) cure of BV using probiotic lactobacilli. Given the correlation between BV and HIV, and the high risk of the latter in Nigeria, intravaginal use of lactobacilli could provide women with a self-use therapy, similar to over-the-counter anti-yeast medication, for treatment of urogenital infections.
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PMID:Clinical study comparing probiotic Lactobacillus GR-1 and RC-14 with metronidazole vaginal gel to treat symptomatic bacterial vaginosis. 1704 32

Polymerase chain reaction (PCR) analysis of bacterial vaginosis as well as of vaginal anaerobe flora (Mycoplasma Hominis, Ureaplasma urealyticum, Gardnerella vaginalis, Bacteroides spp. and Mobiluncus curtisii) was performed in women with antenatal foetus death. Specimens from forty women with this pathology were studied. Control group consisted of 100 pregnant women of the adequate age groups and gestation periods, but with live foetus. Vaginal smears treated by the use of polymerase chain reaction method showed that in the cases of antenatal foetus death in 70% of women Lactobacillus spp. was completely absent. This bacterium was observed only in 30% of these women. In 75% of women with live foetus Lactobacillus spp. was observed, while in 25% it was not present. Increase of quantity of anaerobic vaginal flora was observed in women, where the antenatal death of foetus was diagnosed. Percentage significance of these indices in women with live foetus was comparatively lower.
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PMID:[Vaginosis in patients with antenatal foetus death]. 1705 5

In the past several years, the collective understanding of cervicitis has extended beyond the recognition of Chlamydia trachomatis and Neisseria gonorrhoeae as the prime etiologic suspects. Trichomonas vaginalis and herpes simplex virus cause cervicitis, and both Mycoplasma genitalium and bacterial vaginosis have emerged as new candidate etiologic agents or conditions. However, major gaps in our knowledge of this common condition remain. Putative etiologic agents have not been identified in many women with cervicitis. Moreover, cervicitis occurs in a relatively small proportion of women with chlamydia or gonorrhea. Finally, scant research has addressed the clinical response of nonchlamydial and nongonococcal cervicitis to antibiotic therapy, and there are no data on the benefit of sex partner treatment for such women. New research into the etiology, immunology, and natural history of this common condition is needed, especially in view of the well-established links between cervicitis and an increased risk of upper genital tract infection and human immunodeficiency virus type 1 acquisition.
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PMID:Management of women with cervicitis. 1734 63

Mycoplasma hominis was isolated from a Bartholin's gland abscess 70 years ago, and ureaplasmas were isolated from the genital tract about 20 years later. Subsequently, reports incriminating mycoplasmas in the known adverse outcomes of pregnancy have been legion. Without doubt these genital mycoplasmas are able to invoke an inflammatory response and take part in the cascade of events that culminates in preterm birth. Their role in this and other conditions is becoming clearer, but controversy remains due mainly to investigators often ignoring bacterial vaginosis, with its complex of bacteria, and failing to disentangle their role from that of the genital mycoplasmas. This is a theme that will be highlighted in this chapter, in which an attempt is made to indicate what is indisputable (surprisingly little) and what is not, and where further research would be helpful.
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PMID:The role of mycoplasmas in pregnancy outcome. 1737 11

Mycoplasma hominis and Ureaplasma urealyticum are frequently isolated from the cervical and vaginal tracts of HIV-negative asymptomatic women. Published data lack indisputable conclusions and doubts still exist as to whether these mycoplasmas are pathogens or mere co-factors associated with genital infections. We therefore conducted a surveillance study to investigate the prevalence of genital mycoplasmas in HIV-1 positive women (110 patients), attending the outpatient Infectious Diseases Clinic of our tertiary referral Hospital, by speculum examination, PAP test, endocervical and vaginal swabs obtained by gynaecologists. Ureaplasma urealyticum was isolated from the cervix of 45 women (41%). Mycoplasma hominis was recovered from 12 women (11%), in four of whom it was isolated at the same time from the vagina. PAP test results ruled out subclinical cervicitis in all women. Bacterial vaginosis, assessed by Amsel criteria and the Nugent score, was absent in all women. Our data show that the mycoplasmas in question are found in the lower genital tract of asymptomatic HIV-1-positive women at a frequency similar to that reported in the HIV-negative female population, and make a role for these microorganisms unlikely in the aetiology of cervico-vaginal infections also in this particular patient population.
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PMID:Prevalence and clinical significance of Ureaplasma urealyticum and Mycoplasma hominis in the lower genital tract of HIV-1-infected women. 1738 88

Mycoplasmas comprise a big group of organisms consisting of one hundred eighty species which are found in nature as parasites of humans, other mammals, reptiles, fishes and plants, or living as commensals. The group commonly referred to as genital mycoplasmas comprise species most often found in the genitourinary tract of sexually active adults as common commensal inhabitants, or pathogens which can cause many different infections. The species we are most interested in this work are called: Mycoplasma genitalium, Mycoplasma hominis and Ureaplasma urealyticum. There is no doubt that they can cause non-gonococcal urethritis (NGU) in both men and women and bacterial vaginosis (BV), cervicitis, endometritis. Infection can spread to the upper port of female genital tract and it can lead to pelvic inflammatory disease, or if it happens during pregnancy--to chorioamnionitis and further pregnancy complications. Even though mycoplasmas have been known and described since 1898, the problem of their morbidity and the possible influence they have on human fertility is still not clear. Similar to research from 30 years ago, connecting Chlamydia trachomatis with infertility, new scientific work as well as the dynamic development of diagnostics procedure, especially more common use of PCR method, may be helpful in discovering the potential role genital mycoplasmas play in infertility.
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PMID:Genital mycoplasmas--morbidity and a potential influence on human fertility. 1740 Nov 88


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