Understanding the Epidemiology
and Transmission Dynamics
of the HIV/AIDS Pandemic
James Chin, MD, MPH
Clinical Professor of Epidemiology
School of Public Health, University of California, Berkeley
E-mail: jchin@socrates.berkeley.edu
CCIH, May 2003
As a staff member of the Global Programme on AIDS (GPA) of the World Health Organization (WHO) in Geneva from the beginning of GPA in 1987 until my resignation from WHO in 1992, I was responsible for surveillance, forecasting and impact assessment of the HIV/AIDS pandemic.  My responsibilities included developing methods for the surveillance of HIV/AIDS and for the estimation and projection of HIV prevalence.  In addition, I was asked to brief all new GPA staff (HQ and field) on the current status of the pandemic.  I found that most of the staff who were joining GPA in the late 1980s did not have a good understanding (as it was understood at that time) of the estimated HIV/AIDS numbers and the basic epidemiology of HIV.  I have found that this general situation continues for many if not most AIDS workers, AIDS advocates and AIDS activists.
This presentation was prepared to provide persons who are interested in or working in HIV/AIDS programs with an objective review of the current estimates of HIV/AIDS and with my understanding of the basic epidemiology and the transmission dynamics of HIV infections.