Duncan A Mackellar

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CONTEXT Studies conducted in the late 1980s on human immunodeficiency virus (HIV) infection among older men who have sex with men (MSM) suggested the epidemic had peaked; however, more recent studies in younger MSM have suggested continued high HIV incidence. OBJECTIVE To investigate the current state of the HIV epidemic among adolescent and young adult(More)
In collaboration with the Centers for Disease Control and Prevention, participating state and local health departments, universities, and community-based organizations applied venue-based, time-space sampling methods for the first wave of National HIV Behavioral Surveillance of men who have sex with men (NHBS-MSM). Conducted in 17 metropolitan areas in the(More)
Previous studies have documented disparities in HIV prevalence by race among men who have sex with men (MSM), even after adjusting for traditional risk factors. In this analysis of data collected for the 1999-2000 Los Angeles Young Men's Survey, a cross-sectional venue-based survey of MSM aged 23-29, we investigated whether information on male sex-partner(More)
Traditional sampling methods are unsuitable for determining the levels of human immunodeficiency virus type I infection and related behavioral risk factors among young men who have sex with men. Most surveys of this hard-to-reach population have used nonprobability samples of young men in clinical or public settings. While these studies have revealed high(More)
OBJECTIVE To determine if an association exists in young men who have sex with men (MSM) between being under the influence of alcohol or drugs during sex and participation in sexual behaviors which increase the risk of human immunodeficiency virus (HIV). STUDY DESIGN A total of 3492 young MSM were interviewed through the Young Men's Survey, an anonymous,(More)
BACKGROUND The yield of nucleic acid amplification testing (NAAT) after routine screening for human immunodeficiency virus (HIV) antibody to detect acute HIV infection (AHI) may vary with different HIV-antibody assays. METHODS From April 24, 2006, through March 28, 2008, patients underwent routine HIV-antibody screening using a first-generation assay at(More)
Using data from a multisite venue-based survey of male subjects aged 15 to 22 years, we examined racial/ethnic differences in demographics, partner type, partner type-specific condom use, drug use, and HIV prevalence in 3316 US black, multiethnic black, Latino, and white men who have sex with men (MSM). We further estimated associations of these factors(More)
This study evaluated the magnitude and distribution of unrecognized HIV infection among young men who have sex with men (MSM) and of those with unrecognized infection, the prevalence and correlates of unprotected anal intercourse (UAI), perceived low risk for infection, and delayed HIV testing. MSM aged 15-29 years were approached, interviewed, counseled,(More)
OBJECTIVES We sought to characterize substance use patterns in young men who have sex with men (MSM) in 7 US urban areas and sociodemographic characteristics and history associated with such use. METHODS We examined data collected from 1994 through 1998 in a venue-based, cross-sectional survey. RESULTS Among the 3492 participants, 66% reported use of(More)
BACKGROUND Correlates of main reasons for not HIV testing, HIV testing intentions, and potential use of an over-the-counter rapid HIV test (OTCRT) among men who have sex with men who have never tested for HIV (NTMSM) are unknown. METHODS We evaluated these correlates among 946 NTMSM from 6 US cities who participated in an internet-based survey in 2007. (More)