Dr. Andrew G. Vayonis

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 highly rated in 7 conditions, according to our data. His top areas of expertise are Vocal Cord Dysfunction, Asthma, Angioedema, and Hives.

Merritt Fajt, MD, specializes in allergy and immunology and is certified in allergy and immunology by the American Board of Allergy and Immunology. She practices at UPMC Presbyterian, UPMC Magee-Womens Hospital, UPMC Shadyside, UPMC Mercy, and UPMC East. Dr. Fajt is affiliated with University of Pittsburgh Physicians, Department of Medicine. She completed her residency at Penn State University College of Medicine and her medical degree at Temple University School of Medicine. Dr. Fajt specializes in treating patients with asthma and immunologic disorders. Dr. Fajt is highly rated in 6 conditions, according to our data. Her top areas of expertise are Vocal Cord Dysfunction, Asthma, Angioedema, and Eosinophilic Asthma.

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 highly rated in 9 conditions, according to our data. His top areas of expertise are Allergic Rhinitis, Sinusitis, Grass Allergy, and Allergic Conjunctivitis.