HIV figures overstated by Millions

Should anyone be surprised by this? The NY Times reports:

In the past, global health officials have treated the epidemic as a cyclone spiraling ever upward with no end to new infections in sight.But better surveys, particularly a household survey in India, have driven the figures down.Until recently, most national estimates were made by giving anonymous blood tests to some young women who came into public health clinics because they were pregnant or feared they had a sexually transmitted disease; those results were expanded with statistical models.But epidemiologists have realized that such a method — usually applied in big urban clinics because it was more efficient — oversampled prostitutes, drug abusers and people with multiple partners, and ignored rural women. Then the statistical extrapolations exaggerated those errors.