RESULTS: An RNAi construct targeting the RNA recognition motif of the Aedes aegypti transformer-2 (tra-2) gene does not trigger female-to-male sex conversion as commonly observed among dipterous insects. Instead, homozygous insects show greater mortality among m-chromosome-bearing sperm and mm zygotes, yielding up to 100% males in the subsequent generations. The performance of transgenic males was not significantly different to wild-type males in narrow-cage competitive mating experiments.
CONCLUSION: Our data provide preliminary evidence that the knockdown of Ae. aegypti tra-2 gene expression causes segregation distortion acting at the level of gametic function, which is reinforced by sex-specific zygotic lethality. This finding could promote the development of new synthetic sex distorter systems for the production of genetic sexing mosquito strains.
AIMS: The present study aimed to examine the fit of different measurement models for the AUDIT and its measurement invariance across a wide range of subgroups by country, language, gender, and sexual orientation.
METHODS: Responses concerning past-year alcohol use from the participants of the cross-sectional International Sex Survey were considered (N = 62,943; Mage: 32.73; SD = 12.59). Confirmatory factor analysis, as well as measurement invariance tests were performed for 21 countries, 14 languages, three genders, and four sexual-orientation subgroups that met the minimum sample size requirement for inclusion in these analyses.
RESULTS: A two-factor model with factors describing 'alcohol use' (items 1-3) and 'alcohol problems' (items 4-10) showed the best model fit across countries, languages, genders, and sexual orientations. For the former two, scalar and latent mean levels of invariance were reached considering different criteria. For gender and sexual orientation, a latent mean level of invariance was reached.
CONCLUSIONS: In line with the two-factor model, the calculation of separate alcohol-use and alcohol-problem scores is recommended when using the AUDIT. The high levels of measurement invariance achieved for the AUDIT support its use in cross-cultural research, capable also of meaningful comparisons among genders and sexual orientations.
AIM: To review the prevalence and factors associated with sexual abstinence in young (10-24 years) and middle-aged (25-59 years) men.
METHODS: Studies were retrieved from Science Direct, PubMed, and EBSCOhost published from 2008 to 2019. The selection criteria were original population- or community-based articles, published in the English language, on sexual abstinence, and in young and middle-aged men.
MAIN OUTCOME MEASURE: This article reviewed the literature on the proportions of and factors associated with sexual abstinence in young and middle-aged men.
RESULTS: A total of 13,154 studies were retrieved, from which data were extracted for 37 population- or community-based studies. The prevalence of sexual abstinence varied from 0% to 83.6% in men younger than 60 years. The prevalence of primary sexual abstinence was 3.4%-83.3% for young men and 12.5%-15.5% for middle-aged men. The prevalence of secondary abstinence for young men ranged from 1.3% to 83.6%, while for middle-aged men, it was from 1.2% to 67.7%. The prevalence of sexual abstinence decreased with increasing age in young men but increased with increasing age in middle-aged men. The significant factors reported were age, single status, poor relationships, low socioeconomic status, sex education, religious practices, caring and monitoring parents, and not using alcohol, cigarettes, or drugs. Although the variations in findings from different studies can be explained by different regions and cultures, the information cannot be generalized worldwide because of a lack of studies in Asian and Australian populations.
CLINICAL IMPLICATIONS: The studies on sexual abstinence in the future should use a consistent and standard definition, cover all sexual behaviors, and investigate all related factors.
STRENGTH & LIMITATIONS: The restricted timeframe (2008-2019), English language, availability of full text, and variability in definition and time duration may be the sources of bias.
CONCLUSION: Young men had higher proportions of sexual abstinence than middle-aged men, and age, unavailability of a partner, lower educational levels, low socioeconomic status, conservative and religious conditions, and no or less knowledge about sexually transmitted infections were common predictors of sexual abstinence in most of the men. Although determinants of sexual abstinence were identified, further investigation of biological factors in men younger than 60 years is needed. Irfan M, Hussain NHN, Noor NM, et al. Sexual Abstinence and Associated Factors Among Young and Middle-Aged Men: A Systematic Review. J Sex Med 2020;17:412-430.
METHODS: We conducted a cross-sectional online survey among Malaysian MSM (August to September 2021). Participants completed questionnaires, including socio-demographic characteristics, HIV/STI testing practices, drug- and sex-related behaviors, and knowledge and attitudes toward HIV prevention services. Out of 1,799 completed surveys, 870 were included in the analysis after eliminating duplicates and incomplete surveys. We used logistic regression to determine factors associated with never-testing for HIV.
RESULTS: Overall, one-third of the study participants (33.8%) reported having never tested for HIV. Of those who reported to have tested for HIV (n = 576), half reported that they had tested for HIV in the past 6 months (50.3%). In multivariable logistic regression, MSM with HIV sero-concordant partner (aOR = 3.44, 95% CI = 1.56-7.60), without a prior diagnosis of a sexually transmitted infection (aOR = 2.83, 95% CI = 1.46-5.49), unaware of pre-exposure prophylaxis (PrEP; aOR = 2.71, 95% CI = 1.74-4.21), unaware of someone taking PrEP (aOR = 1.64, 95% CI = 1.15-2.35), and unwilling to use PrEP (aOR = 2.48, 95% CI = 1.43-4.30) had higher odds of never been tested for HIV. In contrast, MSM who were older (aOR = 0.95, 95% CI = 0.93-0.97) and of the Malaya ethnic group (aOR = 0.59, 95% CI = 0.37-0.95) had lower odds of never testing for HIV.
CONCLUSION: Our findings shed light on the characteristics of HIV never-testers among MSM in Malaysia. The results indicate the need for innovative strategies to increase the uptake of HIV testing services among members of the MSM community.
METHODS: Urdu-speaking volunteers were recruited via outreach strategies, for participation in focus groups. Four focus group discussions were conducted on three distinct themes: 1/ Sexual Health Promotion, 2/Hepatitis and sexually transmitted infections, and 3/ Mental Health. The focus groups were recorded, with the written consent of the users. Thematic analysis was conducted after transcription of the focus-group discussion.
RESULTS: We succeeded in mobilizing 4 Pakistani users, aged between 19 and 30 years. The group dynamics was very rich and allowed us to highlight numerous social aspects related to the importance of the group belonging, the family, and others points of view on these topics. Many Urdu vocabulary had to be redefined and revealed the extent of the pre-existing taboo.
CONCLUSIONS: Notwithstanding the extreme difficulty of mobilizing an invisible target population on a sensitive topic such as sexual and mental health, our experience highlights the need to consider the knowledge of the people concerned. The participative approach allowed us to fit the content of our medium to, for instance: the collectivist type of society of the target population; the level of literacy in their mother tongue; and to the embodiment of some taboo in their vocabulary. Although time and energy consuming, our approach seems relevant and could be replicated to other communities.