Characteristics of the Largest Network Component of Individuals With or Exposed to Early Syphilis in Central Indiana: 2016 to 2017.

Background: The surge of syphilis infections in the United States continues. This study examined the sexual networks of early syphilis cases to determine whether repeat infection, demographics, or behaviors differed among network components (groups of connected persons).

Methods: We examined a retrospective cohort of all early syphilis cases in Central Indiana reported from January, 1, 2016, to January 24, 2018, in the state's reporting database.