People
Luis Parra-Rodriguez, MD
Assistant Professor of Medicine
- Email: lparra-rodriguez@wustl.edu
Dr. Parra-Rodriguez specializes in the longitudinal clinical care of people with HIV, with a special clinical research focus on aging, age-related clinical conditions, and mental health in people with HIV.
Jennifer A. Philips, MD, PhD
Theodore and Bertha Bryan Professor, Departments of Medicine and Molecular Microbiology; Co-Chief, Infectious Diseases Division
- Phone: 314-747-8058
- Email: philips.j.a@wustl.edu
Dr. Philips is principal investigator of an NIH-funded lab that studies how Mycobacterium tuberculosis evades the host immune response.
Marilia R. Pinzone, MD
Instructor of Medicine
- Email: marilia@wustl.edu
Dr. Pinzone’s interests are HIV, TB and viral infections in immunocompromised hosts.
Nongnooch Poowanawittayakom, MD
Assistant Professor of Medicine
- Email: nongnooch@wustl.edu
Dr. Poowanawittayakom interests are in bone and joint infection, infection prevention/control, hepatitis C, emerging infectious diseases, and global health.
William G. Powderly, MD
J. William Campbell Professor of Medicine
- Phone: 314-454-8287
- Fax: 314-454-8294
- Email: wpowderly@wustl.edu
Dr. Powderly has been actively involved in HIV-related clinical research for over thirty years with specific interests in opportunistic infections, metabolic complications and long-term outcomes of antiretroviral therapy.
Rachel M. Presti, MD, PhD
Professor, Infectious Diseases | Medical Director of the Infectious Disease Clinical Research Unit (IDCRU)
- Phone: 314-454-8215
- Fax: 314-454-5392
- Email: prestir@wustl.edu
Dr. Presti specializes in clinical and translational research in infectious disease, with a special focus on HIV, SARS-CoV-2 and other viral infections.
Jeanette Pytlinksi, AGACNP-BC
Nurse Practioner - Outpatient
- Phone: 314-747-3581
- Email: pytlinskij@wustl.edu
Jeanette sees patients at the
Infectious Diseases Clinic
620 South Taylor Ave., Suite 100
St. Louis, MO 63110
Appointments: 314-362-9098
Fax: 314-362-9851
Aditi Ramakrishnan, MD, MSc
Assistant Professor of Medicine
- Email: aditir@wustl.edu
Dr. Ramakrishnan’s research focuses on applying implementation science strategies to improve domestic HIV prevention and care, particularly for cisgender women.
Christian Ratzlaff, DO
First Year Fellow
- Email: cratzlaff@wustl.edu
Dr. Ratzlaff grew up in Hillsboro, KS. He completed his BS in Medical Molecular Biology at Oral Roberts University in 2018 and Doctor of Osteopathic Medicine at Arkansas College of Osteopathic Medicine in 2022. He completed his Internal Medicine Residency at UAMS Northwest in 2025, where he was Chief Resident from 2024-2025. His areas of clinical interest include emerging pathogens, antimicrobial-resistant organisms, and infections in immunocompromised hosts, including invasive fungal infections. Outside of medicine, Dr. Ratzalff enjoys staying active, including long walks in Forest Park with his bernedoodle, Chip. He also likes trying new restaurants with his wife, finding the St. Louis food scene a very pleasant surprise.
Why did you choose WashU for your ID fellowship?
“I chose WashU for fellowship training because of its high clinical volume and complex patient population, which draws referrals from multiple surrounding states. I was also drawn to the strength of the program and department leadership, as well as the opportunity to learn from faculty who are leaders in their fields.”
Adriana M. Rauseo, MD
Assistant Professor of Medicine
- Phone: 314-454-8254
- Email: a.rauseoacevedo@wustl.edu
Dr. Rauseo specializes in clinical infectious diseases, with a special focus on mycology and infectious that affect immunocompromised hosts. Since the outset of the COVID-19 pandemic she has served as an investigator in the Infectious Disease Clinical Research Unit (ID-CRU) in multiple clinical trials and translational research in the fight against COVID-19.
Prashanth Reddy, MD, MPH
First Year Fellow
- Email: kpreddy@wustl.edu
Dr. Reddy grew up across several states in south India and calls the entire region his home. He completed his medical education at the Kasturba Medical College Mangalore of Manipal University, earning an MBBS in 2014. He then earned his MPH at the University of Edinburgh in 2020 before going on to complete his residency at Garden City Hospital through Michigan State University in 2025. His areas of interest include STIs, parasitology, HIV/AIDS and anti-microbial stewardship. On his day off, you can find him going for a run in Forest Park or hiking the Mural Mile.
Why did you choose WashU for your ID fellowship?
“WashU has one of the most robust Infectious Disease divisions in the country with global leaders across several domains of the specialty. The diversity and complexity of the patient profile encountered here, coupled with a rigorous and perfectly designed program, hones your skills and molds one to practice ID anywhere in the world.”
Hilary E.L. Reno, MD, PhD
Professor of Medicine
- Phone: 314-454-8354
- Fax: 314-454-5392
- Email: hreno@wustl.edu
Dr. Reno specializes in sexual health care, with a special focus on the clinical care of sexually transmitted infections (STI) and the intersection with HIV prevention.
Colleen Richmond, RN, BSN, MPH
Clinical Research Nurse Coordinator
- Phone: (314)273-2498
- Email: cmrichmond@wustl.edu
Bruce A. Rosa, PhD
Associate Professor of Medicine
- Phone: 314-273-5550
- Email: barosa@wustl.edu
Dr. Rosa’s experience in the statistical analysis of complex datasets (utilizing multiple types of evidence spanning treatments or species) has led to the identification differentially expressed genes, drug targets and pathways of interest for experimental verification.
Sena Sayood, MD
Assistant Professor of Medicine
- Phone: 314-454-8254
- Email: sjsayood@wustl.edu
Dr. Sayood performs clinical research with a specific focus on antimicrobial stewardship and clinical decision support.
Britanny Schneider
Clinical Research Coordinator, BS
- Phone: (314)273-1717
- Email: sbrittany@wustl.edu
Mary Scott MD
Medical school: Washington University in St. Louis School of Medicine, St. Louis,
Residency: Washington University in St. Louis/Barnes-Jewish Hospital