Now, you can Self-schedule your appointments! 

In our continuing effort to better service you, DeMera Allergy is pleased to share a new service for our new and established patients. We know your lives are busy, and your time is valuable. Now, you can self-schedule your appointments with us at your convenience from your preferred device.

Latest News

Meet Busar, our 1st Orangutan patient

Demera Allergy helps Busar the Orangutan with his symptoms

Read more about this story on Your Central Valley

About DeMera Allergy Asthma & Immunology Center

The DeMera Allergy Asthma & Immunology Center is committed to providing thorough, individualized care to every patient. Unlike other centers, we won’t simply continue prescribing you medications until we find one that works. We’ll take the time to diagnose you correctly, finding the root of your problem and treating it in the most effective way possible.


The specialists and staff at DeMera Allergy Asthma & Immunology Center pride themselves on providing the best care possible. When you call our offices, we’ll schedule your appointments without delay and answer your questions promptly.


Asthma and allergies affect thousands of people in the Fresno and Visalia areas. If you’re one of them, it’s time to stop suffering and start breathing clearly once again. Contact us today to schedule an appointment.

Video Procedure

Referring Doctors
Allergy Report

Pollen Allergy Report

Monday 09/06/21: HIGH

Tuesday 09/07/21: HIGH

Wednesday 09/08/21: Medium-High

Thursday 09/09/21: HIGH

Friday 09/10/21: HIGH

Saturday 09/11/21: HIGH

Sunday 09/12/21: HIGH

 

Based on Pollen.com for the greater Fresno Area

Check Before you Burn and Air Quality
Outstanding Facility. Dr. Demera and his staff are wonderful. Very professional… I highly recommend to all A++
Debbie Zaura
Debbie Zaura
15:44 15 Sep 21
Jessica was great and very informative regarding my case!!!!!
john GORSKY
john GORSKY
17:33 18 Aug 21
Dr Sherman is by far one of the finest physicians I've seen in my 70 years.
Mehmet Noyan
Mehmet Noyan
17:09 13 Aug 21
Dana & Dr. Sherman are wonderful! I called in with concerns about a nasalplasty that I had with another Dr. and no one else would help me. She told me the Dr. was not taking new patients but really wanted to help me. She said she would call me back the next week. I thought. Ya right. Just like the others said but she did call back and got me in to see the Dr. two days later. He confirmed what I had suspected with my nose and is getting me set up to see a Dr. at UC Davis to fix the problems. I am so grateful!!!
Christy Sasser
Christy Sasser
17:18 13 Aug 21
Felt good to get the wax out of our ears.
Kay Mcbee
Kay Mcbee
23:23 09 Aug 21
Pleasant experience. Every one was courteous and friendly. I liked Jennifer Ruch a great deal. I would recommend her to my friends.
Gay Olsen
Gay Olsen
18:21 24 Jun 21
DeMera Allergy, Asthma, and Immunology Center is by far the most professional, courteous, and caring office I’ve been to in the area. Wonderful care.
Linda Staicer
Linda Staicer
16:34 31 Mar 21
I have been seeing Dr. Demera and his staff for years. EVERYONE is always so kind and helpful. Dr. Demera takes his time during the visits and makes you feel like a valued human being. He has shown such patience and understanding as part of my ED recovery team.Jessica preforms my yearly scopes and she is always so sweet and personable. She remembers personal facts about you which makes you feel…well…memorable!Dr. Sherman was key in diagnosing my LPR. And although I haven’t worked with him since, he was a very kind and gentle doctor. He was determined to diagnose me and was very prompt with referring me out for further tests.I have never had to wait more than five minutes and the office staff are welcoming and efficient.Through the expertise and help of Dr. Demera, Dr. Sherman and Jessica, I have overcome many of my issues and am able to manage the ones that linger.I highly recommend Demera Allergy.
Aline Kaufmann
Aline Kaufmann
04:39 22 Jul 21
Provider seen patient quickly. Staff is friendly.
Jennelle Trujillo
Jennelle Trujillo
16:45 12 Apr 21
Dr. DeMera and his staff have always treated my family and I with the utmost respect. We are always greeted with a smile and prompt attention is given the minute you step into his office. The staff is welcoming and always attentive to our needs. Dr. DeMera is always friendly with his warm smile and witty personality. He truly wants to know how his patients are doing in general before he addresses the visit and your specific needs, all without making you feel rushed.
carrie reed
carrie reed
15:53 04 Jul 21
They listened, and are the first Dr in 2 years to diagnose my issue. I'm beyond happy.
Amy Cron
Amy Cron
18:21 08 Jun 21
From the front desk through the exam and on to the follow up with referrals , tests, and prescriptions the staff at DeMera is ultra professional, personable, and caring. I am reluctant to post this just because I want to keep these people to myself and not have them overwhelmed. But my experience with Jessica and Jennifer as nurse practitioners is that they are very knowledgeable and thorough. They don’t just look at everything as an allergy, and seem to take a broader approach considering what other body functions might be coming into play. I trust them to find out what’s going on with me and my family more than I trust my general practitioner! Imagine that. As far as I am concerned, they are among the best doctors in Fresno.
Mike Griffin
Mike Griffin
18:19 07 Sep 21
Great staff!
Benjamin Clement
Benjamin Clement
16:48 31 Mar 21
Cared about my Heath and how they could get better results for me!
Lisa Leone
Lisa Leone
05:39 11 May 21
My family and I have been coming here for years. Dr. DeMera spends as much time with me as I need, and is very caring and compassionate. I feel very well taken care of by Dr. DeMera and his staff.
Mari Harris
Mari Harris
17:09 22 Apr 21
they were on time for patients.
Peter Berndt
Peter Berndt
01:20 19 Sep 21
I always impressed and thankful I found them.
Jason Thomas
Jason Thomas
16:55 02 Jul 21
Phone appointment with Dr. DeMera. Great idea! I miss the in-person connection but it was great to save time and energy arranging transportation, getting to appt, sitting & waiting! It was great sitting at home, getting things done, and doing my waiting there and Dr. D could call when he was ready for me instead of rushing around!
Judi Sommarstrom
Judi Sommarstrom
16:18 27 May 21
They are very prompt on my appointments rarely wait more than 5 minutes. Staff is friendly & welcoming. I see Jennifer & she is always helpful, thorough, very professional. This office is great!!!
Linda Bacome
Linda Bacome
17:50 15 Jun 21
Dr. Sherman is AMAZING!!
Anahi Delacruz
Anahi Delacruz
17:48 27 Aug 21
I cannot say enough good things about this office. All of my doctors are afflliated with Stanford, except for my allergist and ENT which are Dr. DeMera and Dr. Sherman in Fresno. Their office runs like a well oiled machine, just like Stanford Health Care does. I can't say this about any of the other doctors offices that I have visited in the Central Valley. The doctors and staff are personable, knowledgeable, and efficient!
Christine Serrano
Christine Serrano
19:22 31 Jul 21
Very helpful staff and always with a smile
Bob Green
Bob Green
00:13 02 Jul 21
Dr DeMera and staff are great. Excellent care very accommodating. Dr DeMera goes the extra mile to get to a diagnosis
Ron Rustigian
Ron Rustigian
18:22 31 Mar 21
Dr DeMera has been treating our two children for over 10 years I am so thankful for his great care of our children’s nut allergies his staff is also wonderful!
sylviahg70
sylviahg70
16:58 14 Jul 21
DeMera Allergy Center is top tier in knowledge and service to me. Jessica Halstead has been working with me to control and maintain my medical condition, and I thank her and the DeMera group for taking me on as their patient...
cary yee
cary yee
19:30 12 Jun 21
I love how the nurse practitioner listens to my concerns and always explains everything in detail. I highly recommend Demera for all your allergy needs.
Lupe Heng
Lupe Heng
20:15 15 Sep 21
They are the very best at their specialties!
Michael Keitz
Michael Keitz
19:11 07 Sep 21
Friendly, caring, and intelligent!
J L
J L
16:33 23 Jul 21
Never a wait time - everyone is professional and I feel like my concerns and issues are met. My only frustration is that still waiting for the doctor to change the pressure readings on my new AVC ResMed device. They cannot ship it until they have the new readings because the Phillips machine normally used has been recalled and the settings are not the same on the ResMed device. Not sure why the delay.
Barbara Hayden
Barbara Hayden
00:21 07 Aug 21
Dr. Bret Sherman is the best. Timely and always so pleasant. I feel confident after he has examined my ears and completed the necessary treatment. Yay for Dr. Sherman.
Sue Kendall
Sue Kendall
17:05 20 May 21
Wonderful staff and so knowledgeable. I am so thankful to them 💓
Dawn Zinger-Corley
Dawn Zinger-Corley
19:02 20 Apr 21
Very professional staff, no unnecessary waiting. The nurse is thorough and takes a keen interest in the health of her patients.
Cl Montgomery, Jr
Cl Montgomery, Jr
22:31 07 Apr 21
Dr y
Annette Fields
Annette Fields
10:16 20 Jul 21
Friendly staff! I never have to wait long for my appointment. Dr. DeMera is caring and helpful!
Linda Gandy
Linda Gandy
19:19 29 Jun 21
I was greeted by friendly, courteous front-desk staff, and brought back to the examination room as soon as I sat down in the waiting room.The assistant was very friendly as she covered the preliminary stuff - blood pressure check, pulse, temperature - then, the wait to see Jennifer Ruch was not more than two minutes. Jennifer is very friendly, understanding, and thorough. It would be super if all visits to all of my medical care people went as smoothly as did this one!
Patrick Wolfenbarger
Patrick Wolfenbarger
18:03 21 Jul 21
I've been a patient of Dr. Demera for 15 years! The doctor is very professional and he's caring of his patients. He will discuss your concerns without rushing you off. His office staff are friendly and efficient, I would highly recommend Dr. Demera for your asthma and allergy needs.
Enrica Torres
Enrica Torres
17:02 08 Jul 21
Dr. Sherman is knowledgable, professional and personable. One of the best ENTs in the Central Valley. I highly recommend him.
Diane Sellers
Diane Sellers
17:20 30 Jul 21
Very professional staff and providers.
Mayra Enriquez
Mayra Enriquez
17:21 06 Apr 21