STD Surveillance System
Surveillance information on the incidence and prevalence of STDs is used to inform public and private health efforts to control these diseases. Case reporting data are available for nationally notifiable chanchroid, chlamydia, gonorrhea, and syphilis. Surveillance of other STDs, such as genital herpes, simplex virus, genital warts, or other human papillomavirus infections and trichomoniasis are based on estimates of office visits to physicians' office practices provided by the National Disease and Therapeutic Index.
National Center for Health Statistics. Health United States 2009: With Special Feature on Medical Technology. Hyattsville, Maryland. 2010; pg 485.