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This is an exploratory study in which the investigators will develop a way to identify the cell responses most strongly associated with protection against chlamydia infection. This study is not driven by a hypothesis.
With more than 90 million new cases annually, Chlamydia trachomatis is the most common sexually transmitted bacterial disease. Untreated endocervical C. trachomatis infections can cause pelvic inflammatory disease (PID), a disorder of the endometrium, fallopian tubes, and adjacent structures that occurs after ascension of the bacterium from the lower to upper genital tract. Adverse outcomes secondary to C. trachomatis-induced PID include tubal infertility, ectopic pregnancy, and chronic pelvic pain. Vaccine development has been identified as essential for control of C. trachomatis infections, and current evidence suggests that an effective vaccine will likely be based on several C. trachomatis antigens. Experimental models of infection have identified HSP60, major outer-membrane protein (MOMP), outer membrane protein 2 (OMP2), and polymorphic membrane protein D (PmpD) as promising vaccine candidates. A prospective study of Kenyan commercial sex workers found that production of interferon-gamma (IFN-γ) by peripheral blood cells stimulated with chlamydia heat-shock protein (HSP60) strongly correlated with protection against incident C. trachomatis infection. This proposal details an exploratory identification of the antigen-specific cell mediated immune responses associated with antecedent C. trachomatis infection in women.
C. trachomatis is an obligate, intracellular, gram-negative microorganism recognized as the most common bacterial sexually transmitted disease worldwide. The highest rates of infection with this organism are consistently found among adolescents and young adults. Young women are also the group most adversely impacted by the effects of C. trachomatis infection on reproductive health. While approximately 70% of infections with C. trachomatis in young women are asymptomatic, 20% - 40% of these occult infections will progress from endocervical inflammation to the development of PID. In addition to its strong association with PID, C. trachomatis infection is also thought to enhance HIV transmission and contribute to human papilloma virus induced cervical neoplasia. Although data from both experimental models and clinical studies suggest that antigen specific CD4+ and CD8+ T cells are required for optimal control of genital tract chlamydial infections, the current lack of information regarding the specific C. trachomatis antigens eliciting protective immune responses in humans hinders vaccine development.
This is an exploratory investigation in which we will develop the methodology needed to identify the antigen-specific cell mediated immune responses most strongly associated with protection against incident C. trachomatis infection.
Observational Model: Case-Only, Time Perspective: Cross-Sectional
Magee-Womens Hospital of UPMC
University of Pittsburgh
Published on BioPortfolio: 2014-07-23T21:13:28-0400
Multicenter prospective cohort study in Chlamydia trachomatis positive women after regular treatment to understand the transmission of anorectal CT infections.
Sexually transmitted Chlamydia trachomatis infections are a widespread public health concern due to their prevalence and potentially devastating reproductive consequences, including pelvic...
This study, named "Check it," is a bundled program for African American (AA) men ages 15-24 that includes community testing for chlamydia and gonorrhea, expedited treatment for subjects wh...
Chlamydia is a common infection among youth and can be given from one person to another during sex. Many people who have chlamydia have no signs of infection at all, but can pass the infec...
This is a randomized controlled trial to determine whether a home screening test for chlamydia and gonorrhea will lead to increased use of screening tests and increased detection of sexual...
Chlamydia antigen analysis enables understanding of disease pathogenesis, facilitates development of diagnostic immunoassays and is essential to the design of a subunit Chlamydia trachomatis vaccine. ...
Chlamydia trachomatis is a common, often recurring sexually transmitted infection, with serious adverse outcomes in women. Current guidelines recommend retesting after a chlamydia infection, but the o...
Neisseria gonorrhoeae (gonorrhea) could become untreatable in the near future. Indeed, while the treatment of symptomatic gonorrhea in core groups, such men who have sex with men (MSM), is crucial for...
Chlamydia trachomatis is a bacterial agent that causes sexually transmitted infections worldwide. The regulatory functions of dendritic cells (DCs) play a major role in protective immunity against Chl...
Species of CHLAMYDIA causing pneumonitis in mice and hamsters. These isolates formerly belonged to CHLAMYDIA TRACHOMATIS.
A genus of the family CHLAMYDIACEAE whose species cause a variety of diseases in vertebrates including humans, mice, and swine. Chlamydia species are gram-negative and produce glycogen. The type species is CHLAMYDIA TRACHOMATIS.
Type species of CHLAMYDIA causing a variety of ocular and urogenital diseases.
Infections with bacteria of the genus CHLAMYDIA.
A chronic infection of the CONJUNCTIVA and CORNEA caused by CHLAMYDIA TRACHOMATIS.
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