This symposium from the Penn Center for AIDS Research addresses basic, clinical and behavioral sciences themes in HIV/AIDS research, as well as issues that pertain to the urban and international AIDS epidemics. The Penn Center for AIDS Research is one of 20 NIH-funded CFARs and includes HIV and AIDS investigators at the University of Pennsylvania, the Children’s Hospital of Philadelphia (CHOP) and the Wistar Institute. From the Series:9th Annual National CFAR Science Symposium