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


“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


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“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

Jill Curren

Nurse Practitioner


“I have been in the medical field for more than 30 years and have always felt it was the right career path for me.  Being able to treat the whole person—body, mind and spirit as well as considering the whole family is the true calling of a Nurse Practitioner.” 

Nurse Practitioner Jill Curren is a key part of the Sher Allergy Specialists team and brings a wealth of diverse nursing expertise and insights gleaned over her 30+ year career. In addition to seeing clinic patients, Jill applies her meticulous attention to detail to the Sher Allergy’s clinical research trials.  As a Family Practice Nurse Practitioner, Jill understands the individuality of each person and approaches their allergic condition care with expertise and sensitivity.


  • University of South Florida, Master's Degree in Nursing


  • American Academy of Nurse Practitioners


  • Nurse Practitioner of the Year Nominee - Take Care Health System 2010


  • Member of American Academy of Nurse Practitioners

  • Member of Florida Association of Nurse Practitioners


  • Nurse Practitioner versus Physician's Assistant: Do you know the Difference? 
    2005 Journal of Medical Surgical Nursing

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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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