David Janssen, MD

David Janssen, MD, is a board-certified infectious disease physician who sees patients 18 and older for a wide variety of infectious diseases and infectious disease-related issues. Conditions he treats include postoperative wound infections, fevers of unknown origin, viral, bacterial, and fungal infections, parasitic infections, osteomyelitis, and septic arthritis. He also performs specialized infectious disease testing, imaging studies, and manages drug therapies.

Dr. Janssen is a compassionate provider who clearly explains the diagnostic process and treatment options, working closely with patients to create personalized treatment plans that preserve and enhance their quality of life. 

Dr. Janssen is originally from Indiana and has lived in St. Louis since 1993.

Dr. Janssen earned his medical degree from Indiana University School of Medicine in Indianapolis, Indiana. He completed his internal medicine residency at St. Vincent Hospital and Health Care Center in Indianapolis, Indiana and his infectious disease fellowship at the University of Michigan Medical Center in Ann Arbor, Michigan.

This practice is part of BJC Medical Group of Missouri and Illinois.