Any communicable disease that strikes urban populations poses difficult problems for public health officials. First, treatment in the early stages of these diseases may be based primarily on guesswork; before the etiology of the disease is fully known, public health officials are often prompted by public fear to take action to curb and treat the disease (Terris, 1985). Second, even when effective treatments have been identified, these may be politically costly. When dealing with communicable diseases, responsible public health professionals have at times concluded that measures such as quarantine, mass screening, or mandatory reporting of the disease are necessary. Mandatory reporting of previous sexual partners by carriers of any sexually transmitted diseases may prove embarrassing or destructive to an individual’s business or social life. In the face of such threats, individuals who face such measures may mount political campaigns against them, making them risky for public health officials. Third, even when effective treatments are known, they may be very expensive to administer and may tax existing public facilities (hospitals, clinics) and funding for public health.