Midcareer Mentoring Award for Patient-Oriented Research in Chlamydia trachomatis Infection - Modified Project Summary/Abstract Section This application is for a renewal of my K24 Midcareer Investigator Award in Patient-Oriented Research (POR) on Chlamydia trachomatis (CT) Infections. I, Dr. William Geisler, am a federally funded physician scientist at the University of Alabama at Birmingham (UAB) with expertise in CT infections and significant mentoring experience. During the initial K24 period, I obtained new funding (R01 renewal, a new R01, a new R21, etc.), expanded my POR program in new directions, had 35 publications, became UAB Assistant Dean for Physician Scientist Development, and mentored 16 early stage investigators who had many successes (awards included a K08, KL2, TL1, an F30, an F31-D, etc.). The protected time afforded by this K24 renewal would enable me to: 1) broaden my mentoring knowledge and develop new research skills, 2) continue providing POR mentoring to early-stage investigators, and 3) expand my research program in new directions. Despite current CT prevention and control efforts, CT infection rates continue to rise, and CT remains the most prevalent bacterial STI worldwide, one with significant disparities in certain patient populations and associated with reproductive morbidity. A CT vaccine is urgently needed. However, a better understanding of immunogenetic determinants that impact CT infection risk and which CT antigens are most immunogenic and induce protective immunity to CT is needed to advance vaccine development; my Current POR is focused on this need (2R01AI093692 and 1R01AI148359). CT vaccine availability does not ensure it will be implemented. Lessons learned from implementation of other vaccines have taught us that specific factors can affect vaccine implementation and studies on factors affecting CT vaccine implementation are needed. In this K24 renewal, I plan to broaden my mentoring knowledge through didactic and interactive experiences, develop new research skills in entrepreneurship and research commercialization through didactic and experiential training under mentorship, and continue mentoring early stage investigators in POR. Mentees will be provided with educational and research experiences tailored to their career stage and interests. Mentoring will be on my Current CT immunogenetics POR (noted above and discussed in detail in this application) and on two new POR studies suported by this K24 renewal award that will expand my CT POR program. New Study 1 aims to determine if HLA-DQB1*06 and CT-specific CD4+ IFN- can be useful biomarkers for predicting incident CT infection; I previously found that DQB1*06 was a risk marker and CD4+ IModified Project Summary/Abstract Section This application is for a renewal of my K24 Midcareer Investigator Award in Patient-Oriented Research (POR) on Chlamydia trachomatis (CT) Infections. I, Dr. William Geisler, am a federally funded physician scientist at the University of Alabama at Birmingham (UAB) with expertise in CT infections and significant mentoring experience. During the initial K24 period, I obtained new funding (R01 renewal, a new R01, a new R21, etc.), expanded my POR program in new directions, had 35 publications, became UAB Assistant Dean for Physician Scientist Development, and mentored 16 early stage investigators who had many successes (awards included a K08, KL2, TL1, an F30, an F31-D, etc.). The protected time afforded by this K24 renewal would enable me to: 1) broaden my mentoring knowledge and develop new research skills, 2) continue providing POR mentoring to early-stage investigators, and 3) expand my research program in new directions. Despite current CT prevention and control efforts, CT infection rates continue to rise, and CT remains the most prevalent bacterial STI worldwide, one with significant disparities in certain patient populations and associated with reproductive morbidity. A CT vaccine is urgently needed. However, a better understanding of immunogenetic determinants that impact CT infection risk and w