Year 1

Dr. Cunningham was born and raised in Scottsdale, AZ. He earned his PhD at the University of Missouri. He then completed his medical education at Mayo Clinic Alix School of Medicine and his residency at the Mayo Clinic Arizona before returning to Missouri for his ID fellowship at WashU Medicine. His areas of interest are transplant ID, medical education and invasive fungal infections. He is also an avid rock climber.

Why did you choose WashU for your ID fellowship?
“I chose WashU for the excellent training it offers across the full spectrum of infectious diseases, from bread-and-butter cases to unusual infections in severely immunocompromised patients. No matter what you want to pursue within ID, you will receive excellent support from program leadership.”

Dr. Hahn was born and raised in Oklahoma City. She completed her medical education at the University of Vermont Larner School of Medicine in 2022 and her residency at the Cleveland Clinic in 2022. Her areas of interest are antibiotic stewardship and vector-borne illnesses. When not at the hospital, she loves to go running in Forest Park.

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.”

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.”