PURPOSE: To examine factors associated with completing enrollment milestones in the Together 5,000 cohort of at-risk men (n = 8661), transmen (n = 53), and transwomen (n = 63) who have sex with men. METHODS: Between 2017-2018, participants completed an online enrollment survey and were offered opportunities to complete an incentivized secondary online survey as well as selfadministered at-home HIV testing (OraSure HIV-1 Oral specimen collection device). We explored factors associated with completing each study component. RESULTS: In total, 8,777 individuals completed our enrollment survey, 6,166 (70.3%) completed the secondary survey, and 5,010 returned the at-home HIV test kit that was mailed to them (81.3% of those mailed a kit). Consistent with other researchers, in our multivariable models, those who were White, with more years of education, were more likely to complete study components, although the magnitude of these associations was small. For example, 50.9% of those enrolled, 47.9% of those completing the secondary survey, and 46.8% of those completing HIV testing were persons of color-a statistically significant, but meaningfully insignificant decline. CONCLUSIONS: These findings highlight the ongoing need for researchers to identify barriers that may prevent persons of color and younger individuals from participating in research studies.

No abstract

Synthesis of novel peptide linkers was accomplished by monocarboxylation of 1,3,5-tris(bomomethyl)benzene with a wide variety of carboxylic acids in the presence of diisopropylethylamine. These reagents can be used to simultaneously cyclize and label peptides containing two cysteines. Many labels are compatible with this method including lipids, fluorescent groups, and biotin.

No abstract

No abstract

Internet-based recruitment can be effective in reaching large numbers of geographically diverse individuals. Geosocial sexual networking apps on smartphones have emerged as the modal way in which men who have sex with men (MSM) meet sex partners, and as venues for sexual health research. We report on the performance of three types of ads—text-only, text with male figure (no face), and text with male figure (with face)—used on a geosocial sexual networking app to advertise free at-home HIV testing and to enroll in an online study. We ran five 2-week-long ads on a popular MSM geosocial app between fall 2017 and spring 2018 (~2.19 million impressions). Ads were evaluated in terms of the click-through rate (CTR = advertisement clicks/advertisement impressions), conversion rates (CR = number of enrolled participants/ad-generated clicks), cost per enrolled participant, and demographic composition of survey respondents. We enrolled n = 4,023 individuals, n = 2,430 of whom completed HIV testing—$6.21 spent on advertising per participant enrolled and $10.29 spent for everyone who completed HIV testing. Cost per enrolled participant was associated with the content of the ad used—ads featuring male figures (with or without a face shown) were more cost efficient than ads featuring text alone. These ads also outperformed text-only ads across a range of metrics, including responsiveness among younger MSM as well as MSM of color. Advertising materials that combine text with images may have greater appeal among priority populations.

No abstract

No abstract