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 07/19/21: Medium

Tuesday 07/20/21: Medium

Wednesday 07/21/21: Medium

Thursday 07/22/21: Medium

Friday 07/23/21: Medium

Based on Pollen.com for the greater Fresno Area

Check Before you Burn and Air Quality
Dr Demera is a caring doctor who is very personable. Takes his time with the patient to figure out what is going on. The staff has to be the best in the valley. Would highly recommend Dr Demera!!!
Donna Wright
Donna Wright
16:55 01 Feb 21
Provider seen patient quickly. Staff is friendly.
Jennelle Trujillo
Jennelle Trujillo
16:45 12 Apr 21
I always impressed and thankful I found them.
Jason Thomas
Jason Thomas
16:55 02 Jul 21
I have been a patient of Dr. Demera’s for 10+ years. He and his staff are very professional and courteous. Dr. Demera is very knowledgeable and will work hard to find the best treatment for you.
Kim Valdez
Kim Valdez
18:16 24 Mar 21
I personally had seen Dr. Demera for years and plan to go back in a few months. Out of two options from Valley Children’s hospital for my sons asthma I didn’t even let them finish their recommendation. I cut them off and let them know I’d be taking my son to Dr. DeMera. I had received excellent care in the previous years and yesterday’s visit made me feel confident that my sons health is in the best care.
Sarah Hernandez
Sarah Hernandez
17:08 16 Mar 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
Upbeat and friendly staff.
Z
Z
16:10 24 Mar 21
The staff is very friendly. And Dr.Demera is great. They get you in and they get you out. I would recommend them to anyone that I know. The office is very clean
Mark White
Mark White
03:27 10 Mar 21
What a great place! Friendly staff and beautiful facility. Dr was amazing. On time and very thorough. One of the best sr visits I’ve ever had! Excellent job. Thanks guys!
freddi67200
freddi67200
17:15 18 Mar 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
Dr. Demera and Dr. Sherman are caring ❤ Dr's and really seem to take an interest in their patients. When you are dealing with an issue they follow up with you in a timely manner to see how new treatment is going and if not going well, they try out something new and continue to check back until they get it right.
Sarah Diaz
Sarah Diaz
17:02 18 Mar 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
Great staff!
Benjamin Clement
Benjamin Clement
16:48 31 Mar 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
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
Dr Sherman is an amazing thorough Dr!! It is clear that he takes great care in his patients. Office Staff is kind and helpful as well! I wish I had found Dr Sherman years ago.
Corincia Perez
Corincia Perez
18:15 08 Mar 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
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
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
Great staff..knowable caring doctors.
Tammie Hill-Moss
Tammie Hill-Moss
01:17 12 Mar 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
They have helped me more than any other place has. I used to have severe asthma and allergy symptoms but now I’m able to walk more and actually able to breathe through my nose. The staff is very kind and they pull you in quick.
Dalilah Rivas
Dalilah Rivas
15:57 22 Sep 20
I found DeMera Allergy after my allergist retired. I have been so impressed with this office. Everyone is polite and professional. I have received top notch care since I found Dr. DeMera. I highly recommend this office.
Julie O'Keefe
Julie O'Keefe
17:43 30 Mar 21
Thank you for your support!
Joeanna Mendez
Joeanna Mendez
18:15 17 Mar 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
Great place and an awesome allergy doctor. Thank you for helping our family!!!
Dayla Patterson
Dayla Patterson
18:45 09 Mar 21
Very helpful staff and always with a smile
Bob Green
Bob Green
00:13 02 Jul 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
Wonderful staff and so knowledgeable. I am so thankful to them 💓
Dawn Zinger-Corley
Dawn Zinger-Corley
19:02 20 Apr 21
Dr y
Annette Fields
Annette Fields
10:16 20 Jul 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. 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
Very professional staff and providers.
Mayra Enriquez
Mayra Enriquez
17:21 06 Apr 21
My appointment time was on time so I didn’t have to wait which I appreciated. Everyone wascourteous and well mannered. It was a overallpositive experience.
Larry Joneson
Larry Joneson
18:10 17 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
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
It was quick and efficient . Office staff are very friendly and kind. Dr. DeMera is also kind and helpful. He makes one feel cared for.
Cynthia Miller
Cynthia Miller
18:12 08 Mar 21
The office staff was friendly and efficient. To my surprise I was called to the back within 5 minutes, the doctor was in right after that. We went over my history. Tests were done, results were good. The doctor actually listened to my concerns and has requested other tests to be done.Overall experience was a good one for being a new patient.
Guadalupe Aguilar-Oftedal (Bebe)
Guadalupe Aguilar-Oftedal (Bebe)
17:00 18 Mar 21
All the nurses and staff are very nice and professional. The nurses that give my daughter allergy shots always talk to her and make sure she has a water to drink after her shots 😁 They are very welcoming as well. Dr DeMera is by far the best allergies my daughter had so far. He takes time to explain everything. Highly recommend this to anyone that needs a good allergist. Thank you all
pearla gates
pearla gates
22:13 20 Nov 19
Friendly, caring, and intelligent!
J L
J L
16:33 23 Jul 21
Dr. Sherman is always attentive and responsive to questions. He is always informative and educational. He takes his time and never rushes the visit.
Anthony Yamamoto
Anthony Yamamoto
16:48 24 Mar 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
Cared about my Heath and how they could get better results for me!
Lisa Leone
Lisa Leone
05:39 11 May 21
Dr. DeMera is caring, friendly, and knowledgeable. I trust him explicitly to take of my entire family!
Sheri Xavier
Sheri Xavier
16:34 25 Mar 21