Research ArticleOriginal Research Treatment of Chlamydia and Gonorrhea in Primary Care and Its Patient-Level Variation: An American Family Cohort Study Shiying Hao, Guoyu Tao, William S. Pearson, Ilia Rochlin, Robert L. Phillips, David H. Rehkopf and Neil Kamdar Abstract PURPOSE Chlamydia and gonorrhea are the 2 most common bacterial sexually transmitted infections in the United States. Nonadherence to the Centers for Disease Control and Prevention treatment guidelines remains a concern.