in 1937, Thomas Parran, Surgeon-General of the USA, outlined five critical components he felt were needed for syphilis control as part of efforts to help build public resolve to address the problem, which he referred to as “a shadow on the land”.’ His formula included: (1) case finding through serological screening; (2) prompt, effective therapy for infected persons; (3) identification of people exposed to infectious syphilis; (4) mandatory serological evaluation of people who might transmit infections to others (in 1937 this translated into premarital and obstetric serological testing); and (5) public education about the disease, its manifestations, its consequences, and its general societal importance. These principles have since been adopted to one degree or another as part of efforts to control most other sexually transmitted diseases (STDs) including HIV. In addition, they have worked for syphilis control. Combined with accurate diagnostic tests and effective therapy, Parran’s strategy has helped to nearly eliminate endemic transmission of syphilis from most of western Europe.2,3 These successes, while providing support for Parran’s concepts, have not occurred throughout the world. In many developing nations, syphilis remains as common as it was in the USA early in the 20th century when about 10% of the population was believed to be infected.3’4 Still more notably, in the USA where Parran set forth his formula and where substantially more health care resources are available for STD control, syphilis rates have remained ‘rive-fold to ten-fold higher than for most other developed nations? Working with the Congress of the USA, the Centers for Disease Control and Prevention (CDC) have recently been requested to outline additional efforts and investments needed to eliminate syphilis transmission within the USA The time may be right for such an initiative. In the past 7 years, US syphilis rates have declined precipitously for reasons which are not completely understood. In 1990, the largest number (50 578) of cases of primary and secondary syphilis in 40 years were reported to the CDC (figure l).’ By 1996 the numbers had fallen over 77% to 11 387, and in 1997 fewer than 10 000 cases were reported. These continuing declines have been perceived as a potential window of opportunity for efforts to eliminate endemic transmission of syphilis within the USA. The likelihood of achieving this goal will be determined by the interplay of biological characteristics of the aetiologic agent (Treponema pallidurn), currently available diagnostic tests and therapy, and, possibly, new tools for syphilis control currently under investigation. Most importantly, however, the impact of efforts to eliminate endemic syphilis
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