Individuals recently HIV infected often have high viral loads and may be highly infectious. Risky sexual behavior soon after infection therefore carries high potential for HIV transmission to others. Upon awareness of recent HIV infection, some but not all individuals change behaviors to reduce their risks of transmitting HIV. Possible mediators of such behavior change include drug use and dynamics of partnerships. Following individuals with recent HIV infection and their partners over time can provide information critical to secondary prevention on how risks taken with partners vary during a time of high infectiousness and allow for estimates of how the spread of HIV is most efficient. The proposed study will extend the behavioral research conducted in the NIAID funded Acute Infection and Early Disease Research Program (AIEDRP) known as The Southern California Primary Infections Program and measure how transmission risks and partnership dynamics change overtime among recently HIV-infected individuals and their partners. We will compare behavioral patterns of recently HIV infected individuals with those with chronic HIV infection and no HIV infection. It will allow for partnership level analyses by actively recruiting sexual partners. Of special focus will be the role of drug use, especially methamphetamine, in affecting behaviors over time and how partnership dynamics interact with drug use to allow for HIV transmission. The proposed study will enroll 150 recently HIV-infected individuals and follow them for one year. We will also recruit at up to 6 sexual partners for each recently HIV infected individual and follow these partners in a """"""""cyber-cohort"""""""". Some sexual partners will be HIV negative and some HIV positive allowing for comparisons of individual behaviors over time by HIV status in the cohort and between serodiscordant and seroconcordant partnerships. The results will feed into mathematical models that will quantify population-level and partnership-level impacts of behavior change by recently HIV infected individuals, using microsimulation to integrate our results with current estimates of temporal infectiousness patterns. Understanding these associations will be critical for interventions that target risk reduction for recently HIV-infected individuals in serodiscordant partnerships. Studying partnerships and transmission within them may elucidate how some men who have sex with men (MSM), especially minority MSM, may bridge HIV across networks and ultimately into the general population.

National Institute of Health (NIH)
National Institute on Drug Abuse (NIDA)
Research Project (R01)
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Behavioral and Social Consequences of HIV/AIDS Study Section (BSCH)
Program Officer
Lambert, Elizabeth
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University of California Los Angeles
Public Health & Prev Medicine
Schools of Public Health
Los Angeles
United States
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Gorbach, Pamina M; Javanbakht, Marjan; Bornfleth, Lorelei et al. (2017) Drug resistant HIV: Behaviors and characteristics among Los Angeles men who have sex with men with new HIV diagnosis. PLoS One 12:e0173892
White, Darcy; Grey, Jeremy A; Gorbach, Pamina M et al. (2017) Racial Differences in Partnership Attributes, Typologies, and Risk Behaviors Among Men Who Have Sex With Men in Atlanta, Georgia. Arch Sex Behav 46:961-975
Aralis, Hilary J; Gorbach, Pamina M; Brookmeyer, Ron (2016) Measuring concurrency using a joint multistate and point process model for retrospective sexual history data. Stat Med 35:4459-4473
Chew, Kara W; Blum, Martha L; Javanbakht, Marjan et al. (2015) Low prevalence of hepatitis C co-infection in recently HIV-infected minority men who have sex with men in Los Angeles: a cross-sectional study. BMC Infect Dis 15:538
Khanna, Aditya; Goodreau, Steven M; Wohlfeiler, Dan et al. (2015) Individualized diagnosis interventions can add significant effectiveness in reducing human immunodeficiency virus incidence among men who have sex with men: insights from Southern California. Ann Epidemiol 25:1-6
Khanna, Aditya S; Roberts, Sarah T; Cassels, Susan et al. (2015) Estimating PMTCT's Impact on Heterosexual HIV Transmission: A Mathematical Modeling Analysis. PLoS One 10:e0134271
Khanna, Aditya S; Goodreau, Steven M; Gorbach, Pamina M et al. (2014) Modeling the impact of post-diagnosis behavior change on HIV prevalence in Southern California men who have sex with men (MSM). AIDS Behav 18:1523-31
Gorbach, Pamina M; Weiss, Robert E; Fuchs, Edward et al. (2012) The slippery slope: lubricant use and rectal sexually transmitted infections: a newly identified risk. Sex Transm Dis 39:59-64
Gorbach, Pamina M; Weiss, Robert E; Jeffries, Robin et al. (2011) Behaviors of recently HIV-infected men who have sex with men in the year postdiagnosis: effects of drug use and partner types. J Acquir Immune Defic Syndr 56:176-82
Javanbakht, Marjan; Guerry, Sarah; Gorbach, Pamina M et al. (2010) Prevalence and correlates of heterosexual anal intercourse among clients attending public sexually transmitted disease clinics in Los Angeles County. Sex Transm Dis 37:369-76

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