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North America and western Europe.2 Information is scarce on trends in Europe and North America for chlamydia (defined here as including only genital chlamydial infection), genital herpes and human papillomavirus infection, and when information is available it covers only the 1990s.3 Although some increases in incidence are documented, it is unclear how much of this upward trend is due to improvements in case ascertainment and surveillance or to actual increases in STD incidence. Most developed countries have seen dramatic declines in the incidence of syphilis and gonorrhea since World War II. Some eastern European countries nevertheless have recently experienced increases in these two STDs. STDs deserve attention not only because of their high prevalence but also because they frequently go undetected and untreated, and can result in serious reproductive morbidity and mortality.4 Compared with the extensive efforts devoted to reChristine Panchaud is an independent consultant, Susheela Singh is director of research, Dina Feivelson is research associate and Jacqueline E. Darroch is senior vice president and vice president for research, all with The Alan Guttmacher Institute, New York. The research on which this article is based was supported by a grant from The Henry J. Kaiser Family Foundation. The authors would like to thank the many individuals and institutions that provided data, support and advice, in particular Willard Cates, Jr., Antonio Gerbase, Melinda Flock, Robbie Jordan, John Paget, Ian Simms and Marita Van de Laar. Sexually Transmitted Diseases Among Adolescents in Developed Countries