scholarly journals Sexually transmitted infections in polygamous mating systems

2013 ◽  
Vol 368 (1613) ◽  
pp. 20120048 ◽  
Author(s):  
Ben Ashby ◽  
Sunetra Gupta
Keyword(s):  
Sexually Transmitted Infections ◽  
Mating Systems ◽  
Disease Incidence ◽  
Sexual Contact ◽  
Small Subset ◽  
Sexually Transmitted ◽  
Pathogen Virulence ◽  
Contact Patterns ◽  
Transmission Pathways ◽  
The Impact

Sexually transmitted infections (STIs) are often associated with chronic diseases and can have severe impacts on host reproductive success. For airborne or socially transmitted pathogens, patterns of contact by which the infection spreads tend to be dispersed and each contact may be of very short duration. By contrast, the transmission pathways for STIs are usually characterized by repeated contacts with a small subset of the population. Here we review how heterogeneity in sexual contact patterns can influence epidemiological dynamics, and present a simple model of polygyny/polyandry to illustrate the impact of biased mating systems on disease incidence and pathogen virulence.

scholarly journals Sexual Contact Patterns in High-income Countries - A Comparative Analysis Using Data From Germany, The UK, and The US

2021 ◽  
Author(s):  
Damilola Victoria Tomori ◽  
Johannes Horn ◽  
Nicole Rübsamen ◽  
Sven Kleine Bardenhorst ◽  
Veronika K Jaeger ◽  
...  
Keyword(s):  
Sexually Transmitted Infections ◽  
National Survey ◽  
Sexual Contact ◽  
Sexual Partners ◽  
High Income ◽  
Sexually Transmitted ◽  
Contact Patterns ◽  
The Us ◽  
Opposite Sex ◽  
The Uk

Abstract Sexual contact patterns determine the spread of sexually transmitted infections, and are a central input parameter for mathematical models in this field. We evaluated the importance of country-specific contact pattern parametrization for high-income countries with similar cultural backgrounds by deriving estimates for sexual contact patterns in Germany from two independent studies (HaBIDS and SBG), and comparing them to data from the National Survey of Sexual Attitudes and Lifestyles (Natsal) in the UK, and the National Survey of Family Growth (NSFG) in the US. UK and US participants reported a substantially higher number of lifetime opposite-sex sexual partners compared to both German studies. The difference in lifetime partners was caused by a higher proportion of individuals with many partners in the young age group (< 24 years) in the UK and the US. Partner acquisition in older age groups was similar. The number of same-sex partners was similar across the countries, while there was heterogeneity in the reported experience with partners from both sexes, consistent with the differences observed for opposite-sex sexual partners. These patterns can lead to substantially different dynamics of sexually transmitted infections across age, and have strong impact on the results of modelling studies.

scholarly journals A risk-based model for predicting the impact of using condoms on the spread of sexually transmitted infections

2017 ◽  
Vol 2 (1) ◽  
pp. 100-112 ◽  
Author(s):  
Asma Azizi ◽  
Karen Ríos-Soto ◽  
Anuj Mubayi ◽  
James M. Hyman
Keyword(s):  
Sexually Transmitted Infections ◽  
Sexually Transmitted ◽  
The Impact

scholarly journals Trend Analysis of Major Sexually Transmitted Infections in China, 1999-2018

2020 ◽  
Author(s):  
Han Chunxia ◽  
Ai Zisheng
Keyword(s):  
Sexually Transmitted Infections ◽  
Sexually Transmitted Diseases ◽  
Prevention And Control ◽  
Temporal Trend ◽  
Sexual Contact ◽  
Annual Percentage Change ◽  
Annual Increase ◽  
Sexually Transmitted ◽  
The Past ◽  
And Control

Abstract Background Sexually transmitted infections (STIs) are mainly transmitted by sexual contact or similar sexual contact, which can cause diseases of genitourinary organs ,accessory lymphatic system and major organs of the whole body. STIs include clinically symptomatic diseases and asymptomatic infections. The World Health Organization (WHO) reports that More than 1 million sexually transmitted infections (STIs) are acquired every day worldwide.By analyzing the temporal trend of the sexually transmitted infections incidence in China in the past 20 years, we can provide a scientific basis for the further development of prevention and control measures related to sexually transmitted infections. Methods Joinpoint regression model is used to fit the incidence data of three sexually transmitted diseases in China from 1999 to 2018. Annual percentage change (APC) and Average annual percentage Change (AAPC) are calculated to evaluate the temporal trend changes of the incidence of three major sexually transmitted diseases. Results The overall incidence of AIDS/HIV has been on the rise for 20 years, rising by an average of 33.7% per year (P < 0.05). The most obvious increase is in 2002–2005, an average annual increase of 102.5%. The overall incidence of gonorrhea is on a downward trend, decreasing by 4.9% per year on average (P < 0.05).However, its incidence shows a slow rising trend from 2012 to 2018, with an average annual increase of 6.0%. The overall incidence of syphilis is also on the rise, increasing by an average of 9.1% per year (P < 0.05). Except 1999–2003, the incidence of syphilis shows a downward trend, and the other time stages shows a significant upward trend. Conclusions In the past 20 years, the corresponding measures have been taken in China for sexually transmitted infections and achieved remarkable results, but the three major sexually transmitted infections are still in the forefront of the reported notifiable infectious diseases incidence in China. At the same time, all sexually transmitted infections are beginning to shift from high-risk population to the general population, especially adolescents and the floating population.Therefore, China should still pay more attention to the prevention and control of STIs to hold back their further spread or epidemic.

scholarly journals Using Joinpoint Regression for the Analysis of Trends in Syphilis Incidence in Poland in the Years 1950–2017

2019 ◽  
Vol 60 (1) ◽  
pp. 7-18
Author(s):  
Marcin Milewski ◽  
Rafał Milewski ◽  
Gabriela Sokołowska ◽  
Anna Justyna Milewska
Keyword(s):  
Transmitted Disease ◽  
Treponema Pallidum ◽  
Epidemiological Studies ◽  
Sexual Contact ◽  
Regression Method ◽  
Serological Response ◽  
Joinpoint Regression ◽  
Sexually Transmitted ◽  
The Impact ◽  
Splitting Time

Abstract Syphilis is a bacterial sexually transmitted disease (STD), whose main route of infection is through sexual contact. In order to diagnose syphilis, Treponema pallidum must be detected in the material sampled from a lesion and a blood test must be performed in order to detect serological response to syphilis. Since 1946, a statutory obligation to report all cases of syphilis has been in force in Poland, which is why data concerning the incidence is available. The aim of this paper is to analyse trends in syphilis incidence in the years 1950–2017 using Joinpoint Regression and to present the impact of prophylaxis and education of society on syphilis prevention. The Joinpoint Regression method indicated the splitting time points of the trend corresponding to real changes in incidence, which corroborates the purpose of using the method in question in epidemiological studies.

scholarly journals Male Urethritis Caused by Trichomonas vaginalis

2021 ◽  
Vol 79 (1) ◽  
pp. 71-73
Author(s):  
Ângela Roda ◽  
João Borges-Costa
Keyword(s):  
Sexually Transmitted Infections ◽  
Sexually Transmitted Diseases ◽  
Trichomonas Vaginalis ◽  
Unusual Case ◽  
Parasitic Infection ◽  
Men And Women ◽  
Sexually Transmitted ◽  
Molecular Assays ◽  
The Past ◽  
The Impact

Trichomoniasis is one of the most common sexually transmitted infections worldwide. In women, Trichomonas vaginalis infection may present with vaginitis, cervicitis, or pelvic inflammatory disease, while in men it is mainly asymptomatic or causes mild and transient symptoms of urethritis, epididymitis, or prostatitis. In the past, little importance had been given to the impact of T. vaginalis infection on men’s health, since it was believed to be a self-limited condition without sequelae. However, there is growing evidence it is associated with more serious disorders in both men and women and efforts to diagnose and treat this parasitic infection have increased. Recent advances in testing for sexually transmitted diseases using multiplex molecular assays have increased diagnostic opportunities for T. vaginalis infection, especially in men, as detection of the parasite by traditional methods is much more challenging. We describe an unusual case of male urethritis caused by T. vaginalis observed in our consultation of Sexually Transmitted Infections.

scholarly journals Impact of chemokine C–C ligand 27, foreskin anatomy and sexually transmitted infections on HIV-1 target cell availability in adolescent South African males

2019 ◽  
Vol 13 (1) ◽  
pp. 118-127
Author(s):  
Clive M. Gray ◽  
Kyle L. O’Hagan ◽  
Ramon Lorenzo-Redondo ◽  
Abraham J. Olivier ◽  
Sylvie Amu ◽  
...  
Keyword(s):  
Gene Expression ◽  
Sexually Transmitted Infections ◽  
Target Cell ◽  
Langerhans Cells ◽  
Medical Male Circumcision ◽  
Sexually Transmitted ◽  
T Cell Migration ◽  
Cell Changes ◽  
The Impact ◽  
Hiv 1

Abstract We compared outer and inner foreskin tissue from adolescent males undergoing medical male circumcision to better understand signals that increase HIV target cell availability in the foreskin. We measured chemokine gene expression and the impact of sexually transmitted infections (STIs) on the density and location of T and Langerhans cells. Chemokine C–C ligand 27 (CCL27) was expressed 6.94-fold higher in the inner foreskin when compared with the outer foreskin. We show that the density of CD4+CCR5+ cells/mm2 was higher in the epithelium of the inner foreskin, regardless of STI status, in parallel with higher CCL27 gene expression. In the presence of STIs, there were higher numbers of CD4+CCR5+ cells/mm2 cells in the sub-stratum of the outer and inner foreskin with concurrently higher number of CD207+ Langerhans cells (LC) in both tissues, with the latter cells being closer to the keratin surface of the outer FS in the presence of an STI. When we tested the ability of exogenous CCL27 to induce T-cell migration in foreskin tissue, CD4 + T cells were able to relocate to the inner foreskin epithelium in response. We provide novel insight into the impact CCL27 and STIs on immune and HIV-1 target cell changes in the foreskin.

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