Second, although 1 study examined individual STI, the measure was based on self-report,24 which potentially increases bias because of underreporting as well as unrecognized or undiagnosed infection. In addition, the study only focused on STI in general, which could limit our understanding of unique relationships with specific infectious organisms. Third, data sources of previous research tend to be at local or state levels,15–17,21–23 which limits external validity of the findings. Therefore, the purpose of our research was to examine relationships between neighborhood social disorganization and trichomoniasis among young adults in the United States.