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Amsterdam-Zuidoost, Netherlands

Heymans R.,Public Health Laboratory | Bruisten S.M.,Public Health Laboratory | Bruisten S.M.,University of Amsterdam | Golparian D.,Orebro University | And 5 more authors.
Antimicrobial Agents and Chemotherapy | Year: 2012

From 2006 to 2008, Neisseria gonorrhoeae isolates were identified with decreased susceptibility to the extended-spectrum cephalosporin (ESC) cefotaxime among visitors of the Amsterdam sexually transmitted infections (STI) clinic, the Netherlands. Spread, clonality, and characteristics of 202 isolates were examined using antibiograms, conventional penA mosaic gene PCR, and N. gonorrhoeae multiple-locus variable-number tandem repeat analysis (NG-MLVA). A strictly defined subset was further characterized by N. gonorrhoeae multiantigen sequence typing (NG-MAST) and sequencing of ESC resistance determinants (penA, mtrR, and porB1b). Seventy-four N. gonorrhoeae isolates with a cefotaxime MIC of >0.125 μg/ml (group A), 54 with a cefotaxime MIC of 0.125 μg/ml (group B), and a control group of 74 with a cefotaxime MIC of <0.125 μg/ml (group C) were included. Fifty-three clonally related penA mosaic-positive isolates (penicillin-binding protein 2 type XXXIV) were identified in group A (n ∇ 47 isolates; 64%) and B (n ∇ 6 isolates; 11%). The 53 penA mosaic-positive isolates were predominantly NG-MAST ST1407 (87%) and contained an mtrR promoter A deletion (98%) and porB1b alterations G101K/A102N. All were assigned to the same NG-MLVA cluster that comprised in total 56 isolates. A correlation was found between decreased cefotaxime susceptibility and ST1407 that was highly prevalent among visitors of the Amsterdam STI clinic. The rapid spread of this strain, which also has been identified in many other countries, might be facilitated by high-risk sexual behavior and should be monitored closely to identify potential treatment failure. Quality-assured surveillance of ESC susceptibility on the national and international levels and exploration of new drugs and/or strategies for treatment of gonorrhea are crucial. Copyright © 2012, American Society for Microbiology. All Rights Reserved. Source


De Vries H.J.C.,STI Outpatient Clinic | De Vries H.J.C.,University of Amsterdam | De Vries H.J.C.,National Institute for Public Health and the Environment CIb RIVM
Clinics in Dermatology | Year: 2014

Homosexuality is a global human phenomenon. Although the American Psychiatric Association removed homosexuality from its list of disorders more than 35. years ago, homophobia among physicians is still widely prevalent. Men who have sex with men (MSM) form a relatively new epidemiological risk group for STI. To perform correct management, clinicians evaluating men with male-male sex contacts for STI related complaints or STI screening must obtain a thorough sexual history. Emerging STI like lymphogranuloma venereum, hepatitis C, and multidrug resistant N. gonorrhea strains have been described first in MSM. STI related proctitis often occur in MSM. Within the MSM population, HIV positive patients form a special group affected by STI related diseases, such as anal carcinoma and neurosyphilis. The final part of this review concludes with recommendations to reduce the STI burden in MSM. © 2014 Elsevier Inc. Source


Heymans R.,Public Health Laboratory | Van Der Helm J.J.,STI Outpatient Clinic | De Vries H.J.C.,University of Amsterdam | Fennema H.S.A.,University of Amsterdam | And 4 more authors.
Journal of Clinical Microbiology | Year: 2010

The diagnosis of syphilis can be complicated when it is based on diverse clinical manifestations, dark-field microscopy, and serology. In the present study, therefore, we examined the additional clinical value of a Treponema pallidum real-time TaqMan PCR for the detection of primary and secondary syphilis. The additional value of the T. pallidum real-time PCR for the diagnosis of primary syphilis was evaluated by the use of three different algorithms: (i) a head-to-head comparison of the dark-field microscopy result and the T. pallidum real-time PCR result, (ii) comparison of the clinical diagnosis made in a sexually transmitted infection clinic (STI) (including by dark-field microscopy) and the T. pallidum real-time PCR result, and (iii) comparison of the clinical diagnosis made in a general practitioner's office (without dark-field microscopy) and the T. pallidum real-time PCR result. A fourth algorithm was used to determine the performance of the T. pallidum real-time PCR regarding the detection of secondary syphilis. From December 2006 to April 2008, 716 patients with suspected cases of primary syphilis and 133 patients with suspected cases of secondary syphilis were included in the study. A kappa value of 0.601 was found for the agreement between dark-field microscopy and the T. pallidum real-time PCR. Good agreement was found between the T. pallidum real-time PCR and both the diagnosis of the general practitioner (kappa = 0.745) and the diagnosis of the STI clinic (kappa = 0.769). The sensitivity with respect to the STI clinic diagnosis was 72.8%, the specificity was 95.5%, the positive predictive value was 89.2%, and the negative predictive value was 95.0%. The T. pallidum real-time PCR is a fast, efficient, and reliable test for the diagnosis of primary syphilis in an STI outpatient clinic and a general practitioner setting, but it has no added diagnostic value for the diagnosis of secondary syphilis. Copyright © 2010, American Society for Microbiology. All Rights Reserved. Source


De Vries H.J.C.,STI Outpatient Clinic | De Vries H.J.C.,University of Amsterdam | Schim Van Der Loeff M.F.,University of Amsterdam | Bruisten S.M.,University of Amsterdam | Bruisten S.M.,Public Health Laboratory
Current Opinion in Infectious Diseases | Year: 2015

Purpose of review: A state-of-the-art overview of molecular Chlamydia trachomatis typing methods that are used for routine diagnostics and scientific studies. Recent findings: Molecular epidemiology uses high-resolution typing techniques such as multilocus sequence typing, multilocus variable number of tandem repeats analysis, and whole-genome sequencing to identify strains based on their DNA sequence. These data can be used for cluster, network and phylogenetic analyses, and are used to unveil transmission networks, risk groups, and evolutionary pathways. High-resolution typing of C. trachomatis strains is applied to monitor treatment efficacy and re-infections, and to study the recent emergence of lymphogranuloma venereum (LGV) amongst men who have sex with men in high-income countries. Chlamydia strain typing has clinical relevance in disease management, as LGV needs longer treatment than non-LGV C. trachomatis. It has also led to the discovery of a new variant Chlamydia strain in Sweden, which was not detected by some commercial C. trachomatis diagnostic platforms. Summary: After a brief history and comparison of the various Chlamydia typing methods, the applications of the current techniques are described and future endeavors to extend scientific understanding are formulated. High-resolution typing will likely help to further unravel the pathophysiological mechanisms behind the wide clinical spectrum of chlamydial disease. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved. Source


De Vrieze N.H.N.,University Utrecht | De Vries H.J.C.,STI Outpatient Clinic | De Vries H.J.C.,University of Amsterdam
Expert Review of Anti-Infective Therapy | Year: 2014

Lymphogranuloma venereum (LGV) is a sexually transmitted infection, previously only seen in tropical regions. This changed in 2003 when the first endemically acquired LGV cases were reported in Rotterdam, the Netherlands, among predominantly HIV positive men who have sex with men (MSM). Early diagnosis is important to prevent irreversible complications and to stop further transmission in the community. In contrast to earlier reports, approximately 25% of LGV infections are asymptomatic and form an easily missed undetected reservoir. The majority of reported infections in MSM are found in the anorectal canal and not urogenital, which leaves the mode of transmission within the MSM network unclear. Given the increasing trend, the LGV endemic is clearly not under control. Therefore directed screening must be intensified. © 2014 Informa UK, Ltd. Source

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