... USA.15Department of Medicine, University of California SanFrancisco, 50 Beale St, San Francisco, CA, 94105, USA.16Department of Epidemiology and Biostatistics, University of California San Francisco, ... individuals ≥50 years of age is rapidlyincreasing [4, 5], yet there is evidence that this older agegroup may not be as aware of HIV infection and the need for preventive measures and less likely to be ... USAFull list of author information is available at the end of the articleAlthoff et al. AIDS Research and Therapy 2010, 7:45http://www.aidsrestherapy.com/content/7/1/45© 2010 Althoff et al;...