Dr. Allison Freeman

Thomas Mertz, DO, PharmD, specializes in allergy and immunology and is board-certified in internal medicine by the American Osteopathic Board of Internal Medicine, pediatrics by the American Osteopathic Board of Pediatrics, and allergy and immunology by the American Board of Allergy and Immunology. He practices at Allergy & Asthma Associates of Pittsburgh and is affiliated with UPMC St. Margaret. Dr. Mertz completed his medical education at Lake Erie College of Osteopathic Medicine, residency at the University of Connecticut School of Medicine, and fellowship at Penn State Health Milton S. Hershey Medical Center. Dr. Mertz is rated as a Distinguished provider by MediFind in the treatment of Immunodeficiency with Hyper IgM Type 1. His top areas of expertise are Allergic Rhinitis, Sinusitis, Grass Allergy, and Allergic Conjunctivitis.

William Corder is an Allergy and Immunologist in Morgantown, West Virginia. Dr. Corder is rated as an Advanced provider by MediFind in the treatment of Immunodeficiency with Hyper IgM Type 1. His top areas of expertise are Common Variable Immune Deficiency, Allergic Rhinitis, Hives, and Sinusitis.

Andrej Petrov, MD, specializes in allergy and immunology and is certified in internal medicine and allergy and immunology by the American Board of Internal Medicine. He practices at UPMC Shadyside, UPMC Mercy, UPMC East, UPMC Magee-Womens Hospital, and UPMC Presbyterian. Dr. Petrov is affiliated with University of Pittsburgh Physicians, Department of Medicine. He completed his medical degree at the University Hospital of Belgrade. Dr. Petrov specializes in immunology and treating patients with allergies. Dr. Petrov is rated as a Distinguished provider by MediFind in the treatment of Immunodeficiency with Hyper IgM Type 1. His top areas of expertise are Vocal Cord Dysfunction, Asthma, Angioedema, and Hives.