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Vaginal microbiota

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https://www.readbyqxmd.com/read/28201724/distinct-effects-of-the-cervico-vaginal-microbiota-and-herpes-simplex-type-2-infection-on-female-genital-tract-immunology
#1
B Shannon, P Gajer, T J Yi, B Ma, M S Humphrys, J Thomas-Pavanel, L Chieza, P Janakiram, M Saunders, W Tharao, S Huibner, K Shahabi, J Ravel, R Kaul
No abstract text is available yet for this article.
February 13, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28178310/diversity-and-composition-of-vaginal-microbiota-of-pregnant-women-at-risk-for-transmitting-group-b-streptococcus-treated-with-intrapartum-penicillin
#2
Luiz Fernando Wurdig Roesch, Rita C Silveira, Andréa L Corso, Priscila Thiago Dobbler, Volker Mai, Bruna S Rojas, Álvaro M Laureano, Renato S Procianoy
BACKGROUND: Administering intravenous antibiotics during labor to women at risk for transmitting Group B Streptococcus (GBS) can prevent infections in newborns. However, the impact of intrapartum antibiotic prophylaxis on mothers' microbial community composition is largely unknown. We compared vaginal microbial composition in pregnant women experiencing preterm birth at ≤ 32 weeks gestation that received intrapartum antibiotic prophylaxis with that in controls. METHODS: Microbiota in vaginal swabs collected shortly before delivery from GBS positive women that received penicillin intravenously during labor or after premature rupture of membranes was compared to controls...
2017: PloS One
https://www.readbyqxmd.com/read/28178052/fecal-microbiota-transplant-for-clostridium-difficile-infection-in-a-pregnant-patient
#3
Bejan J Saeedi, Doree Gardner Morison, Colleen S Kraft, Tanvi Dhere
BACKGROUND: Clostridium difficile infection has been associated with negative outcomes in the general population and in pregnant patients. Fecal microbiota transplant has become the standard for treatment of recurrent as well as refractory C difficile infection. CASE: We present a case of a 28-year-old pregnant woman who presented with recurrent C difficile infection despite treatment with vancomycin and fidaxomicin and underwent a successful fecal microbiota transplant through colonoscopy at 18 weeks of gestation...
February 6, 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28139509/lactobacillus-crispatus-modulates-vaginal-epithelial-cell-innate-response-to-candida-albicans
#4
Xiao-Xi Niu, Ting Li, Xu Zhang, Su-Xia Wang, Zhao-Hui Liu
BACKGROUND: Vulvovaginal candidiasis is caused by Candida albicans. The vaginal epithelium, as the first site of the initial stage of infection by pathogens, plays an important role in resisting genital tract infections. Moreover, lactobacilli are predominant members of the vaginal microbiota that help to maintain a normal vaginal microenvironment. Therefore, Lactobacillus crispatus was explored for its capacity to intervene in the immune response of vaginal epithelial cells VK2/E6E7 to C...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28121709/associations-of-the-vaginal-microbiota-with-hiv-infection-bacterial-vaginosis-and-demographic-factors
#5
Christel Chehoud, Daniel J Stieh, Aubrey G Bailey, Alice L Laughlin, Shannon A Allen, Kerrie L McCotter, Scott A Sherrill-Mix, Thomas J Hope, Frederic D Bushman
OBJECTIVE: We sought to investigate the effects of HIV infection on the vaginal microbiota, and associations with treatment and demographic factors. We thus compared vaginal microbiome samples from HIV+ and HIV- women collected at two Chicago area hospitals. DESIGN: We studied vaginal microbiome samples from 178 women analyzed longitudinally (n = 324 samples), and collected extensive data on clinical status and demographic factors. METHODS: We used 16S rRNA gene sequencing to characterize the bacterial lineages present, then UniFrac, Shannon Diversity and other measures to compare community structure to sample metadata...
January 24, 2017: AIDS
https://www.readbyqxmd.com/read/28120845/association-of-hpv-infection-and-clearance-with-cervicovaginal-immunology-and-the-vaginal-microbiota
#6
B Shannon, T J Yi, S Perusini, P Gajer, B Ma, M S Humphrys, J Thomas-Pavanel, L Chieza, P Janakiram, M Saunders, W Tharao, S Huibner, K Shahabi, J Ravel, A Rebbapragada, R Kaul
Cervical human papillomavirus (HPV) infection may increase HIV risk. Since other genital infections enhance HIV susceptibility by inducing inflammation, we assessed the impact of HPV infection and clearance on genital immunology and the cervico-vaginal microbiome. Genital samples were collected from 65 women for HPV testing, immune studies and microbiota assessment; repeat HPV testing was performed after 6 months. All participants were HIV-uninfected and free of bacterial STIs. Cytobrush-derived T cell and dendritic cell subsets were assessed by multiparameter flow cytometry...
January 25, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28112736/maturation-of-the-infant-microbiome-community-structure-and-function-across-multiple-body-sites-and-in-relation-to-mode-of-delivery
#7
Derrick M Chu, Jun Ma, Amanda L Prince, Kathleen M Antony, Maxim D Seferovic, Kjersti M Aagaard
Human microbial communities are characterized by their taxonomic, metagenomic and metabolic diversity, which varies by distinct body sites and influences human physiology. However, when and how microbial communities within each body niche acquire unique taxonomical and functional signatures in early life remains underexplored. We thus sought to determine the taxonomic composition and potential metabolic function of the neonatal and early infant microbiota across multiple body sites and assess the effect of the mode of delivery and its potential confounders or modifiers...
January 23, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28112691/positive-clinical-outcomes-derived-from-using-a-proprietary-mixture-of-selected-strains-during-pregnancy
#8
Francesco Di Pierro, Annamaria Parolari, Benedetta Brundu, Raffaele Nigro
BACKGROUND: While the use of antibiotic prophylaxis is clearly advantageous to prevent streptococcal infection, it alters the composition of the gut microbiota in mothers and infants. Enterococcus faecium L3 is one of the best studied probiotic strains and shows strong antagonistic activity against Streptococcus agalactiae due to the production of bacteriocins able to inhibit common gut and vaginal pathogens. METHODS: We tested an L3-based probiotic formula (iNatal®) on 127 pregnant women attending our gynaecological unit in 2015...
January 16, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28103952/the-interaction-between-vaginal-microbiota-cervical-length-and-vaginal-progesterone-treatment-for-preterm-birth-risk
#9
Lindsay M Kindinger, Phillip R Bennett, Yun S Lee, Julian R Marchesi, Ann Smith, Stefano Cacciatore, Elaine Holmes, Jeremy K Nicholson, T G Teoh, David A MacIntyre
BACKGROUND: Preterm birth is the primary cause of infant death worldwide. A short cervix in the second trimester of pregnancy is a risk factor for preterm birth. In specific patient cohorts, vaginal progesterone reduces this risk. Using 16S rRNA gene sequencing, we undertook a prospective study in women at risk of preterm birth (n = 161) to assess (1) the relationship between vaginal microbiota and cervical length in the second trimester and preterm birth risk and (2) the impact of vaginal progesterone on vaginal bacterial communities in women with a short cervix...
January 19, 2017: Microbiome
https://www.readbyqxmd.com/read/28103920/ovarian-cycling-and-reproductive-state-shape-the-vaginal-microbiota-in-wild-baboons
#10
Elizabeth A Miller, Joshua A Livermore, Susan C Alberts, Jenny Tung, Elizabeth A Archie
BACKGROUND: The vaginal microbiome is an important site of bacterial-mammalian symbiosis. This symbiosis is currently best characterized for humans, where lactobacilli dominate the microbial community and may help defend women against infectious disease. However, lactobacilli do not dominate the vaginal microbiota of any other mammal studied to date, raising key questions about the forces that shape the vaginal microbiome in non-human mammals. RESULTS: We used Illumina sequencing of the bacterial 16S rRNA gene to investigate variation in the taxonomic composition of the vaginal microbiota in 48 baboons (Papio cynocephalus), members of a well-studied wild population in Kenya...
January 19, 2017: Microbiome
https://www.readbyqxmd.com/read/28095889/evolution-of-gut-microbiota-composition-from-birth-to-24-weeks-in-the-infantmet-cohort
#11
Cian J Hill, Denise B Lynch, Kiera Murphy, Marynka Ulaszewska, Ian B Jeffery, Carol Anne O'Shea, Claire Watkins, Eugene Dempsey, Fulvio Mattivi, Kieran Touhy, R Paul Ross, C Anthony Ryan, Paul W O' Toole, Catherine Stanton
BACKGROUND: The gut is the most extensively studied niche of the human microbiome. The aim of this study was to characterise the initial gut microbiota development of a cohort of breastfed infants (n = 192) from 1 to 24 weeks of age. METHODS: V4-V5 region 16S rRNA amplicon Illumina sequencing and, in parallel, bacteriological culture. The metabolomic profile of infant urine at 4 weeks of age was also examined by LC-MS. RESULTS: Full-term (FT), spontaneous vaginally delivered (SVD) infants' microbiota remained stable at both phylum and genus levels during the 24-week period examined...
January 17, 2017: Microbiome
https://www.readbyqxmd.com/read/28087949/the-vaginal-microbiota-and-urinary-tract-infection
#12
Ann E Stapleton
The vagina is a key anatomical site in the pathogenesis of urinary tract infection (UTI) in women, serving as a potential reservoir for infecting bacteria and a site at which interventions may decrease the risk of UTI. The vaginal microbiota is a dynamic and often critical factor in this pathogenic interplay, because changes in the characteristics of the vaginal microbiota resulting in the loss of normally protective Lactobacillus spp. increase the risk of UTI. These alterations may result from the influence of estrogen deficiency, antimicrobial therapy, contraceptives, or other causes...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28052997/human-three-dimensional-endometrial-epithelial-cell-model-to-study-host-interactions-with-vaginal-bacteria-and-neisseria-gonorrhoeae
#13
Paweł Łaniewski, Adriana Gomez, Geoffrey Hire, Magdalene So, Melissa M Herbst-Kralovetz
Colonization of the endometrium by pathogenic bacteria, ascending from the lower female reproductive tract (FRT), is associated with many gynecologic and obstetric health complications. To study these host-microbe interactions in vitro, we developed a human three-dimensional (3-D) endometrial epithelial cell (EEC) model using the HEC-1A cell line and rotating wall vessel (RWV) bioreactor technology. Our model, composed of 3-D EEC aggregates, recapitulates several functional/structural characteristics of human endometrial epithelial tissue including cell differentiation, junctional complexes/desmosomes, microvilli, membrane-associated mucins and Toll-like receptors (TLRs)...
January 4, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28018325/sensitive-quantitative-analysis-of-the-meconium-bacterial-microbiota-in-healthy-term-infants-born-vaginally-or-by-cesarean-section
#14
Ravinder Nagpal, Hirokazu Tsuji, Takuya Takahashi, Kazunari Kawashima, Satoru Nagata, Koji Nomoto, Yuichiro Yamashiro
For decades, babies were thought to be born germ-free, but recent evidences suggest that they are already exposed to various bacteria in utero. However, the data on population levels of such pioneer gut bacteria, particularly in context to birth mode, is sparse. We herein aimed to quantify such bacteria from the meconium of 151 healthy term Japanese infants born vaginally or by C-section. Neonatal first meconium was obtained within 24-48 h of delivery; RNA was extracted and subjected to reverse-transcription-quantitative PCR using specific primers for Clostridium coccoides group, C...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28017660/prevotella-as-a-hub-for-vaginal-microbiota-under-the-influence-of-host-genetics-and-their-association-with-obesity
#15
Jiyeon Si, Hyun Ju You, Junsun Yu, Joohon Sung, GwangPyo Ko
While the vaginal ecosystem is maintained through mutualistic relationships between the host and the vaginal bacteria, the effect of host genetics on the vaginal microbiota has not been well characterized. We examined the heritability of vaginal microbiota and its association with obesity in 542 Korean females, including 222 monozygotic and 56 dizygotic twins. The vaginal microbiota significantly varied depending on host menopausal status and bacterial vaginosis. Lactobacillus and Prevotella, whose relative abundances are strongly associated with bacterial vaginosis, were the most heritable bacteria among the beneficial and potentially pathogenic vaginal microbiota, respectively...
January 11, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28008325/lactobacilli-dominance-and-vaginal-ph-why-is-the-human-vaginal-microbiome-unique
#16
Elizabeth A Miller, DeAnna E Beasley, Robert R Dunn, Elizabeth A Archie
The human vaginal microbiome is dominated by bacteria from the genus Lactobacillus, which create an acidic environment thought to protect women against sexually transmitted pathogens and opportunistic infections. Strikingly, lactobacilli dominance appears to be unique to humans; while the relative abundance of lactobacilli in the human vagina is typically >70%, in other mammals lactobacilli rarely comprise more than 1% of vaginal microbiota. Several hypotheses have been proposed to explain humans' unique vaginal microbiota, including humans' distinct reproductive physiology, high risk of STDs, and high risk of microbial complications linked to pregnancy and birth...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27983477/comparison-of-culture-dependent-and-culture-independent-molecular-methods-for-characterisation-of-vaginal-microflora
#17
Shirali Pandya, Kavitha Ravi, Vijaya Srinivas, Smitha Jadhav, Anisa Khan, Anjali Arun, Lee W Riley, Purnima Madhivanan
To date, molecular methods that circumvent the limitations of traditional culture methods have not been used to describe the vaginal microflora in India. Here, we compared culture and culture-independent molecular methods in characterising the vaginal microbiota in Indian women. Culture methods involved traditional cultivation on Rogosa and sheep-blood agar, whereas culture-independent methods bypassed a culturing step by performing broad-range 16S rDNA PCR on DNA isolated directly from vaginal swabs. A total of 13 women were included in the study, of which five were characterised as healthy, two were BV-intermediate and six were BV-positive according to Nugent scoring...
December 14, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27914477/in-vitro-rescue-of-genital-strains-of-chlamydia-trachomatis-from-interferon-%C3%AE-and-tryptophan-depletion-with-indole-positive-but-not-indole-negative-prevotella-spp
#18
Noa Ziklo, Wilhelmina M Huston, Kuong Taing, Mohammad Katouli, Peter Timms
BACKGROUND: The natural course of sexually transmitted infections caused by Chlamydia trachomatis varies between individuals. In addition to parasite and host effects, the vaginal microbiota might play a key role in the outcome of C. trachomatis infections. Interferon-gamma (IFN-γ), known for its anti-chlamydial properties, activates the expression of indoleamine 2,3-dioxygenase (IDO1) in epithelial cells, an enzyme that catabolizes the amino acid L- tryptophan into N-formylkynurenine, depleting the host cell's pool of tryptophan...
December 3, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27908986/draft-genome-sequence-of-a-urinary-isolate-of-lactobacillus-crispatus
#19
Travis K Price, Majed Shaheen, Laurynas Kalesinskas, Kema Malki, Evann E Hilt, Catherine Putonti, Alan J Wolfe
While Lactobacillus crispatus contributes to the stability of normal vaginal microbiota, its role in urinary health remains unclear. As part of an on-going attempt to characterize the female urinary microbiota, we report the genome sequence of an L. crispatus strain isolated from a woman displaying no lower urinary tract symptoms.
December 1, 2016: Genome Announcements
https://www.readbyqxmd.com/read/27899809/does-vaginal-delivery-mitigate-or-strengthen-the-intergenerational-association-of-overweight-and-obesity-findings-from-the-boston-birth-cohort
#20
N T Mueller, G Mao, W L Bennet, S K Hourigan, M G Dominguez-Bello, L J Appel, X Wang
BACKGROUND/OBJECTIVES: The intergenerational association of obesity may be driven by mother-to-newborn transmission of microbiota at birth. Yet cesarean delivery circumvents newborn acquisition of vaginal microbiota, and has been associated with greater childhood adiposity. Here we examined the independent and joint associations of maternal pre-pregnancy body mass index (BMI; kg m(-2)) and delivery mode with childhood overweight or obesity. SUBJECTS/METHODS: We prospectively followed 1441 racially and ethnically diverse mother-child dyads in the Boston Birth Cohort until age 5 years (range: 2...
December 20, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
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