BackgroundAt the individual level, higher HIV viral load predicts sexual transmission risk. We evaluated San Francisco's community viral load (CVL) as a population level marker of HIV transmission risk. We hypothesized that the decrease in CVL in San Francisco from 2004–2008, corresponding with increased rates of HIV testing, antiretroviral therapy (ART) coverage and effectiveness, and population-level virologic suppression, would be associated with a reduction in new HIV infections.Methodology/Principal FindingsWe used San Francisco's HIV/AIDS surveillance system to examine the trends in CVL. Mean CVL was calculated as the mean of the most recent viral load of all reported HIV-positive individuals in a particular community. Total CVL was defined as the sum of the most recent viral loads of all HIV-positive individuals in a particular community. We used Poisson models with robust standard errors to assess the relationships between the mean and total CVL and the primary outcome: annual numbers of newly diagnosed HIV cases. Both mean and total CVL decreased from 2004–2008 and were accompanied by decreases in new HIV diagnoses from 798 (2004) to 434 (2008). The mean (p = 0.003) and total CVL (p = 0.002) were significantly associated with new HIV cases from 2004–2008.Conclusions/SignificanceReductions in CVL are associated with decreased HIV infections. Results suggest that wide-scale ART could reduce HIV transmission at the population level. Because CVL is temporally upstream of new HIV infections, jurisdictions should consider adding CVL to routine HIV surveillance to track the epidemic, allocate resources, and to evaluate the effectiveness of HIV prevention and treatment efforts.

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There is an urgent need to measure the impacts of COVID-19 among gay men and other men who have sex with men (MSM). We conducted a cross-sectional survey with a global sample of gay men and other MSM (n = 2732) from April 16, 2020 to May 4, 2020, through a social networking app. We characterized the economic, mental health, HIV prevention and HIV treatment impacts of COVID-19 and the COVID-19 response, and examined whether subgroups of our study population are disproportionately impacted by COVID-19. Many gay men and other MSM not only reported economic and mental health consequences, but also interruptions to HIV prevention and testing, and HIV care and treatment services. These consequences were significantly greater among people living with HIV, racial/ethnic minorities, immigrants, sex workers, and socioeconomically disadvantaged groups. These findings highlight the urgent need to mitigate the negative impacts of COVID-19 among gay men and other MSM. Keywords COVID-19 • Economic impact • Mental health • HIV • AIDS • Gay • Men who have sex with men Resumen Existe una necesidad urgente para medir los impactos de COVID-19 entre hombres gay y otros hombres que tienen sexo con hombres (HSH). Hemos conducido una encuesta multifuncional con una prueba mundial de hombres gay y otros HSH (n = 2732) desde el 16 de Abril hasta el 4 de Mayo del 2020, a través de una aplicación de red social. Nosotros caracterizamos los impactos económicos, de salud mental, prevención del VIH y tratamiento del VIH e impactos a COVID-19 y la respuesta de COVID-19, y examinamos si subgrupos de nuestra población de estudio fueron impactados desproporcionadamente por COVID-19. Muchos hombres no tan solo reportaron consecuencias económicas y de salud mental, sino también interrupciones de prevención y de pruebas de VIH, y cuidado del VIH y servicios de tratamiento. Encontramos consecuencias más significantes entre personas viviendo con VIH, grupos raciales/etnicos, migrantes, sexo servidores, y groupos socioeconomicamente disfavorecidos. Los resultados subrayan la necesidad crucial de mitigar los impactos multifacéticos de COVID-19 entre los hombres homosexuales y otros HSH, especialmente para aquellos con vulnerabilidades entrelazadas.