Thursday, February 18, 2016

Trends in Serosorting & the Association with HIV/STI Risk Over Time among Men Who Have Sex with Men

Serosorting among men who have sex with men (MSM) is common but recent data to describe trends in serosorting are limited. How serosorting affects population-level trends in HIV and other sexually transmitted infection (STI) risk is largely unknown.

We collected data as part of routine care from MSM attending an STD clinic (2002-2013) and a community-based HIV/STD testing center (2004-2013) in Seattle, Washington. MSM were asked about condom use with HIV-positive, HIV-negative and unknown-status partners in the prior 12 months. We classified behaviors into four mutually exclusive categories: no anal intercourse (AI); consistent condom use (always used condoms for AI); serosorting (condomless anal intercourse [CAI] only with HIV-concordant partners); and non-concordant CAI (CAI with HIV-discordant/unknown-status partners; NCCAI).

Behavioral data were complete for 49,912 clinic visits. Serosorting increased significantly among both HIV-positive and HIV-negative men over the study period. This increase in serosorting was concurrent with a decrease in NCCAI among HIV-negative MSM, but a decrease in consistent condom use among HIV-positive MSM. Adjusting for time since last negative HIV test, the risk of testing HIV positive during the study period decreased among MSM who reported NCCAI (7.1% to 2.8%; P=0.02), serosorting (2.4% to 1.3%; P=0.17) and no CAI (1.5% to 0.7%; P=0.01). Serosorting was associated with a 47% lower risk of testing HIV positive compared to NCCAI (adjusted prevalence ratio=0.53; 95% CI=0.45-0.62).

Between 2002 and 2013, serosorting increased and NCCAI decreased among Seattle MSM. These changes paralleled a decline in HIV test positivity among MSM.

Purchase full article at:

  • Department of Epidemiology, University of Washington, Seattle, WA, USA 
  • 2 Department of Medicine, University of Washington, Seattle, WA, USA 
  • 3 Department of Biostatistics, University of Washington, Seattle, WA, USA 
  • 4 Department of Global Health, University of Washington, Seattle, WA, USA 
  • 5 Public Health - Seattle and King County HIV/STD Program, Seattle, WA, USA 
  • 6 Gay City Health Project, Seattle, WA, USA.
  •  2016 Feb 13. 

1 comment:

  1. Hi, I work in a communication company I want to share my testimony to the world, my name is Doris pinto, i am from united kingdom in belfast north ireland, I was a stripper in a club I got effected with HIV due to the nature of my job, In april 15 2013 i was tested positive to HIV, Believe it or not this is a true life experience. This is not design to convince you but its just a personal health experience . I never taught doctor Abija could ever get my HIV-AIDS cured with his healing spell, i have tried almost everything but I couldn't find any solution on my disease, despite all these happening to me, i always spend a lot to buy a HIV drugs from hospital and taking some several medications but no relieve, until one day i was just browsing on the internet when i came across a great post of !Michelle! who truly said that she was been diagnose with HIV and was healed that very week through the help of this great powerful healing spell doctor ,I wonder why he is called the great papa Abija, i never knew it was all because of the great and perfect work that he has been doing that is causing all this. so I quickly contacted him, and he ask me some few questions and so i did all the things he asked me to do, He never collected any money from me until I was finally cured, only to see that at the very day which he said i will be healed, all the strength that has left me before rush back and i becomes very strong and healthy, this disease almost kills my life all because of me, so i went to hospital to give the final test to the disease and the doctor said i am HIV negative, i am very amazed and happy about the healing doctor Abija gave to me from the ancient part of Africa, you can email him now for your own healing too on his email: thank you doctor for healing me from HIV. I am free and happy!