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Sher Allergy Specialists is a premier pediatric and adult allergy, asthma and immunology specialty group located in Largo, FL. Our office welcomes patients from Belleair, Clearwater, Largo, Pinellas Park, Seminole, and St. Petersburg. Patients throughout the state of Florida are welcome for telehealth virtual visits. 

Since opening our doors in 1984, Sher Allergy Specialists has helped generations of families transform their lives through state-of-the-art allergy testing, cutting-edge allergy treatments, and clinical research. Now, more than 30 years later, we remain dedicated to serving our patients through unparalleled patient care and results.


Our doctors are double board-certified in Allergy, Asthma and Immunology in addition to Internal Medicine or Pediatrics, allowing our team to offer personalized care to help each patient live their best life free of the worry, hassle, and danger that accompanies allergic conditions. Start your journey to relief by contacting Sher Allergy Specialists today! 

The Sher Allergy Specialists Team

Dr. Mandel R. Sher

Allergist/Immunologist and Founder

Mandel Sher

“I strive to become a better doctor every day.  I am a specialist who understands that my success in helping patients achieve optimal allergy outcomes is rooted in my being interested and taking the time to understand the whole person.”


Dr. Mandel Sher founded Sher Allergy Specialists out of a deep desire to make people feel better, whether they suffer from straightforward allergies and asthma, or complex medical problems that are yet to be solved. He has extensive training and researching in Allergy, Asthma and Immunology; Pediatrics; Adolescent Medicine; and Pediatric Rheumatology. In addition to leading Sher Allergy Specialists and the Center for Cough, Dr. Sher is a Clinical Professor at the University of South Florida Morsani College of Medicine and previously held the prestigious position of Chief Resident at Boston Children’s Hospital. He is a frequent program faculty for national professional society meetings, contributing author in peer-reviewed medical journals, and serves on committees and in leadership roles for professional societies. He has been honored by patients and peers with awards like “Best Doctor in America” and “Best Allergy and Immunology Specialist in Pinellas County.”


  • Northwestern University Feinberg School of Medicine


  • Duke University Medical Center

  • Boston Children’s Hospital


  • University of Michigan Medical Center

  • Boston Children’s Hospital

Dr. Johana Castro Wagner


Johana Castro
Johana headshot.jpg

“I have committed my life to helping those whose lives are affected by allergic disorders and strive to make a difference to them. My patients know I make communication a priority and when they come to see me they will leave knowing what we are treating and how we are going to achieve success.”  


Dr. Johana Castro Wagner joined the Sher Allergy Specialists team in 2020 following three years with the largest allergy specialty group in South Florida, where she treated pediatric and adult patients with a variety of allergic conditions. Dr. Castro Wagner has a special interest in Food Allergies, Eczema, Hives, and Pediatric Allergy and Asthma, and she leads the Sher Allergy Oral Immunotherapy Clinic for Peanut Allergy. Dr. Castro Wagner trained under Dr. Sher during her USF Allergy and Immunology Fellowship at Johns Hopkins All Children’s Hospital, where she excelled in Allergy and Immunology teaching sessions to pediatric residents-in-training. Dr. Castro Wagner grew up in Venezuela and is fluent in Spanish and English.


  • Universidad Central De Venezuela


  • University of Texas Medical Branch in Texas


  • University of South Florida Department of Internal Medicine and Pediatrics, Division of Allergy and Immunology at Johns Hopkins All Children's Hospital

Lynette Jubay

Physician Assistant

Jill Curren

"I have always reiterated to my patients that you have to live in your body for the rest of your life, so you better take care of it. Allergy and immunology encompasses so many diseases or disorders that can be life-changing for an individual when stabilized and treated properly. I feel so blessed to be a part of a team that can help people truly enjoy and live life to the fullest!"

Lynette is the newest member of our allergy team. She is originally from Texas and moved to Florida in 2017. She has 16 years of experience working in different specialties, including burns and wounds, family practice, emergency medicine, internal medicine and pediatrics. Her broad-based and well-rounded knowledge allows her to truly individualize treatment care plans. 


  • Texas Tech University, Masters in Physician Assistant Studies


  • NCCPA certified

Desk with Stethoscope

Proud members of the American Academy of Allergy, Asthma & Immunology (AAAAI) and the American College of Allergy, Asthma and Immunology (ACAAI).

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