"A service of the U.S. National Library of Medicine, National Institutes of Health"
"Chlamydia is the most common sexually transmitted disease (STD) in the United States, with about three million new cases diagnosed in the country each year. " (Definition, ¶1, 2010.10.02)
"A brief e-mail intervention using social networking sites shows promise in reducing sexual references in the online profiles of at-risk adolescents" (ABSTRACT, Conclusions, ¶1).