Patrick B. Mazi, MD

Patrick B. Mazi, MD

Assistant Professor of Medicine

Dr. Patrick Mazi joined the Department of Medicine in the Division of Infectious Diseases as an Assistant Professor as of July 2023. He graduated from medical school at the University of Missouri-Columbia. He completed internal medicine residency at the Medical College of Wisconsin in Milwaukee. He completed two clinical fellowships at Washington University in St Louis–infectious disease and critical care medicine. During his training he also participated in the Mentored Training Program in Clinical Investigations and completed a master’s degree in clinical Investigation. Dr. Mazi specializes in clinical infectious diseases and critical care medicine with a special focus on invasive fungal infections, infections in immunocompromised hosts, and infections in critically ill patients in intensive care units.

His inpatient clinical duties include attending on the infectious disease transplant consult service and attending in the 7800 BMT ICU. He also provides coverage of the eICU and has an outpatient infectious disease clinic. His research is focused on clinical investigations of invasive fungal infections aimed at improving patient outcomes. Research activities include big-data, epidemiologic studies; clinical trials; and translational research projects. He recently wrote a manuscript on the geographic distributions of Histoplasma, Coccidioides, and Blastomyces which is the largest, patient-level update published since the 1960s. This data was available on, a website he co-developed to allow clinicians to look up local incidence of Histoplasma, Coccidioides, and Blastomyces. He is currently writing a K-level grant aimed at quantifying the risk of invasive Aspergillosis in novel immunomodulatory therapies. He enjoys teaching medical students, residents, and fellows while on clinical service. He has given lectures on fungal infections, sepsis, approach to fever in the ICU, HIV, and malaria.

Patients seen at

Infectious Diseases Clinic
620 South Taylor Ave., Suite 100
St. Louis, MO 63110

  • BA Biology: University of Missouri, Columbia MO (2006)
  • MD: University of Missouri – Columbia School of Medicine, Columbia, MO (2016)
  • Fellowship Infectious Diseases: Barnes-Jewish Hospital, Washington University School of Medicine, St. Louis, Missouri (2023)
  • Medical School Award: Most Outstanding Student Research Presentation, 2nd Place, Annual health Science Day
  • 2016 Himalayan Health Exchange, Shimla, India
    Provided primary care to over 3,000 patients in rural northern India
  • 2014-2016 co-founded University of Missouri Infectious Disease Interest Group. Organized labs, hosted guest speakers, gave microbiology lectures to students, founded an associated journal club, and started an associated research mentorship program. Won “Best New Student Group” for the 2014 academic calendar year.
Future Plans

Dr. Mazi plans to complete a Critical Care Fellowship next year. Following that last bit of training, he plans to pursue an academic research position here at WashU studying fungal infections. Clinically he plans to focus on immunocompromised and critically ill patients.

Selected Publications
  1. Mazi PB, Rauseo AM, Spec A. Blastomycosis. Infect Dis Clin North Am. 2021 Jun;35(2):515-530. doi: 10.1016/j.idc.2021.03.013. PMID: 34016289.
  2. Rauseo AM, Mazi P, Lewis P, Burnett B, Mudge S, Spec A. Bioavailability of Single-Dose SUBA-Itraconazole Compared to Conventional Itraconazole under Fasted and Fed Conditions. Antimicrob Agents Chemother. 2021 Jul 16;65(8):e0013421. doi: 10.1128/AAC.00134-21. Epub 2021 Jul 16. PMID: 34031053.
  3. Baures TJ, Sanchez JL, Mazi PB, Windham SL. Infectious complications of mechanical circulatory support. In: Joyce D, Joyce L, Locke M. Mechanical Circulatory Support: Principles and Applications. McGraw Hill Professional. 2020