Mercy Clinic Children's Infectious Disease and Rheumatology - St. Louis

615 S. New Ballas Road
Suite YG 230
St. Louis, MO 63141
Fax: (314) 251-5430
Hours of Operation:
Monday-Friday: 8 a.m. - 4 p.m.

Although your immune system is designed to protect you from invading organisms, it does not always function perfectly.  In some cases, it is not able to fight off an infection without some extra help.  In other cases, the immune system becomes confused and attacks the body that it is supposed to defend, causing an autoimmune disease.  At Mercy Clinic Children’s Infectious Disease and Rheumatology, we are able to evaluate, diagnose, and treat patients with any of these issues.

Infectious Diseases

  • Identification and treatment of infections from bacteria, viruses, fungi, and parasites
  • Proper and effective antibiotic use
  • Recommendations and precautions for patients at increased risk of contracting infections
  • Support for travelers to other countries


  • Evaluation of suspected autoimmune or autoinflammatory diseases and periodic fever syndromes
  • Treatment of juvenile arthritis, dermatomyositis, lupus, and other vasculitides
  • Utilization of pediatrics-only Test and Treatment Center in Mercy Children’s Hospital for sedated procedures, such as corticosteroid joint injections
  • Access to amazing facilities at Cardinals Kids Cancer Center for outpatient infusions of cutting-edge biologic agents

Mercy doctors are connected by our advanced electronic health record system, so your most up-to-date medical information is instantly available to the caregivers at each point of medical care. This is a true advantage when your care team is working to treat your child’s illnesses.

Patient Forms

Our Providers

Anita Chacko, MD, Mercy
Pediatric Infectious Disease
Mercy Clinic
Bradley W. Ornstein, MD, Mercy
Pediatric Infectious Disease, Pediatric Rheumatology
Mercy Clinic