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.

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 2/14/22:Medium

Tuesday 2/15/22: Low-Medium

Wednesday 2/16/22: Low-Medium

Thursday 2/17/22: Low-Medium

Friday 2/18/22: Low-Medium

Saturday 2/19/22:Low-Medium

Sunday 2/20/22: Low-Medium

Based on Pollen.com for the greater Fresno Area

Check Before you Burn and Air Quality
Quick and pleasant appointment. Dr. DeMera always expresses interest and concern for your allergy situation. Important in this valley!
Kathy Atkins
Kathy Atkins
16:42 13 May 22
Everyone at DeMera Allergy is professional and friendly. I never have to wait any more than a few minutes.
Regina Parker
Regina Parker
23:12 28 Jan 22
Felt good to get the wax out of our ears.
Kay Mcbee
Kay Mcbee
23:23 09 Aug 21
Quick yet thorough. I highly recommend this Dr. DeMera and those that work with him. Nice atmosphere and try to get you in quickly when the need arises.
Julie Duwe
Julie Duwe
16:15 21 Oct 21
Dr. Halstead and the rest of the team at DeMera Allergy have always offered top-notch service and care for me. Injections are speedy and the doctor takes time to get to know me as a patient. I highly recommend their knowledgeable staff for your allergy needs!
Captain Maberu
Captain Maberu
17:32 05 Jan 22
When my wife and I tested positive for COVID-19, we called Dr DeMera office right away and had a video appointment the same day. Dr DeMera checked on us and prescribed us medication to get us back to recovery. I am glad to have Dr DeMera as our family doctor!
Paul Grady
Paul Grady
17:16 03 Jan 22
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
Amazing! Super knowledgeable, explains everything (which I fully appreciate as a nurse, bc not only do I want to know my diagnosis, I also want to learn about it) and He listens to the patients concerns. The office is super friendly, too! I’m so happy I found Dr.Demera! Highly recommend!!
Tara Cucullu
Tara Cucullu
02:07 21 Nov 21
they were on time for patients.
Peter Berndt
Peter Berndt
01:20 19 Sep 21
Staff was amazing! Very friendly, knowledgeable, and professional. Very happy i was referred here.
Damien Stewart
Damien Stewart
04:43 23 Jan 22
Was seen right away. Dr Demera And staff are very nice and professional.
Gayle Angle
Gayle Angle
17:27 11 Feb 22
Dr DEMERA and his staff are amazing! I have had a chronic condition of what I thought was allergies, after being tested it was exactly what Dr DEMERA thought it was. There was no long waiting..... within two days they had my results from the time of walking his office! That is almost unheard of these days! Thankful to him and his staff!
connie ST ANGELO
connie ST ANGELO
17:15 11 Mar 22
Very friendly staff front and back. Excellent experience with doctor.
Barbara Sanchez
Barbara Sanchez
16:10 18 Mar 22
I had a very pleasant experience. Great staff and atmosphere. Dr. DeMera is extremely knowledgeable. He knew exactly what was going on with me. He was very thorough in explaining my diagnosis. I left his office feeling assured and relieved. Dr. DeMera is a physician you must see.
Jeannie Nolte
Jeannie Nolte
16:21 20 Apr 22
Always have a positive and great visit with Demera Allergy. The staff is always courteous and helpful. Always happy to recommend Demera Allergy to friends and family!
Rachel Devoll
Rachel Devoll
16:12 12 Apr 22
Had a 2:00pm followup with Jennifer. Received a reminder the day before and was asked to be there 15 minutes early. Jennifer did a great job answering my questions and going over my status. I was out the door by 2:10pm. Great job DeMera!
Douglas Hunter
Douglas Hunter
15:19 23 Dec 21
Dr. Sherman is the best! Well versed on a great variety of issues, fun to talk to, and very professional.
Paul Nibur
Paul Nibur
20:54 20 Sep 21
Love the kindness at the front desk. And Jennifer is very Calm when talking and explaining my results. Thanks again Manuel
Manuel Alves
Manuel Alves
17:13 04 Feb 22
Very friendly staff and professional
Patricia Lopez
Patricia Lopez
21:07 29 Dec 21
The staff there is very friendly and they take very good care of me there and I’m happy they are there for me.
Denise Carrillo
Denise Carrillo
16:20 17 May 22
The office is impeccable. The staff is friendly, welcoming, and efficient. Dr Demera knew what my diagnosis was, before the test results even came back. He was also personable. I highly recommend, for all of these reasons!
Sarah Chun
Sarah Chun
16:33 05 May 22
The Nurse Practitioner was very thorough and was an excellent listener. She explained everything very clearly in terms of what’s going on and what I could expect for next steps. She and all the staff were very friendly and provided excellent care.
Trish Small
Trish Small
17:16 23 Feb 22
Everyone is so pleasant and patient. The Dr was very patient and asked questions that no other had before.😊
Rosa Lopez
Rosa Lopez
16:38 31 Mar 22
Dr. Demera and his staff are excellent! Both my daughter and I see him and we would definitely recommend. Dr. Demera takes the time to listen to your concerns, he is available when there is an urgent issue, and he genuinely cares about finding a resolution for your allergy needs.
Sarah A
Sarah A
16:19 20 Sep 21
My husband and I both receive evaluation and treatment by doctors here. We receive diagnostic and treatment care for allergy, esophagus health, inner ear, and sleep apnea. Doctors are skillful and personable, straight forward with explanations. Drs DeMera and Sherman are very knowledgable and real problem solvers. They have really helped us to regain control of health matters and helped us enjoy our lives more.
KA Millison
KA Millison
06:45 20 Nov 21
Professional staff that treats patients with dignity and worth!
Vanessa Lee
Vanessa Lee
17:15 24 Nov 21
Dr.Rush is amazing! Very thorough, professional, kind, considerate and caring. Throughout my journey of health I have seen several doctors in different departments and Dr. Rush has been one of the best. She takes time with you and talks to you not at you . It’s greatly appreciated and she is a breathe of fresh air. Can’t say enough and would highly recommend! Thank you for the opportunity to be able to share my experience.
Cynthia Erickson
Cynthia Erickson
18:58 23 Sep 21
Staff is professional and knowledgeable. We’ve been under the care of Dr. DeMera for 15 years and consistently received high quality care in the office, via telephone and referring offices. Dr. DeMera is an expert in his field and has a vast network of collaborating physician experts who have helped meet our health needs.
Mao HerFlores
Mao HerFlores
19:44 28 Dec 21
Always have a pleasant visit. Quick and friendly.
Jose Prieto
Jose Prieto
21:13 10 Mar 22
Jessica was great and very informative regarding my case!!!!!
john GORSKY
john GORSKY
17:33 18 Aug 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
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
They are the very best at their specialties!
Michael Keitz
Michael Keitz
19:11 07 Sep 21
We’re very lucky that Dr DeMera and his staff drive to Visalia from Fresno once a week to treat patients. I would drive to Fresno to see him any day. I’ve been to several doctors over the years with sinus problems. Dr DeMera was the first doctor that talked to me about my past and ran tests instead of just giving me an antibiotic and rush me out the door. His office staff was great also. Very professional and friendly.
Rhonda Junio
Rhonda Junio
17:32 29 Dec 21
Dr. DeMera is so good with my 7-year old son. He has been our allergist since my son was about 15 months old. The staff is great, and I'm happy to say, we rarely have a very long wait to see the doctor at our appointments.
Kelley Kim
Kelley Kim
17:59 30 Oct 21
First time at this facility and was impressed. All the staff were very professional and welcoming. The checkin and checkout process was quick and easy. The FNP that I saw was very thorough and had a great bedside manner. Glad my MD referred me here!
Denise Glessner
Denise Glessner
18:01 30 Sep 21
Love Dr. Demera! He always reassures me that everything is going to be ok and I can call and get ahold of him with any kind of emergency!
Kristin Le Fore
Kristin Le Fore
19:26 20 Jan 22
Very friendly staff that truly made our visit a positive experience.
Amie Wilson
Amie Wilson
17:20 03 Dec 21
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
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!Updated 12/1/21 - still the best! Office staff is very efficient and helpful! Dr. D friendly, professional and very thorough! I never feel rushed and get all my questions and concerns addressed!
Judi Sommarstrom
Judi Sommarstrom
04:55 02 Dec 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
Loves to teach you about your condition and is an expert among experts
Sam T
Sam T
17:09 10 Nov 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
Absolutely loving working with this office and Dr Demera. He is intelligent, thoughtful and willing to go the extra mile for his patients. He takes the time to clearly explain all aspects and actively listens to feedback from his patients to make an action plan together. Exceptional service rarely found locally and is on par with high level University patient care.
Kendra Thacker
Kendra Thacker
18:47 18 Oct 21
I love my doctor she has so far found different things that are wrong with me I I’m glad that I found her so far things have gone good I would recommend them
mary tello
mary tello
17:14 02 Mar 22
Dr. Demera is nothing short of an Angel on Earth!I can’t say enough about him, and how grateful I am for his help recently. I was literally at the end of my rope, after 6 weeks of excruciating ear pain, with many medical people prescribing the wrong medications and shrugging me off. Dr. Demara went above and beyond to get me the help I needed. We need more physicians that truly care about helping people. This one does! That’s for sure.
Kristi Ferrucci
Kristi Ferrucci
17:43 07 Apr 22
Professional, quick and friendly
Tom Lingenfelter
Tom Lingenfelter
17:42 23 Dec 21
really friendly staff and kinda awesome that they are having a pumpkin contest for their staff for halloween, you can tell they really put the effort in on that and its nice to see places that care about their employees too, because happy employees take better care of patients.
Heather Gill
Heather Gill
18:13 21 Oct 21
I couldn’t make my appointment because I had back surgery, so I canceled it the day before. The doctor called me the next morning and asked if I wanted to do a Telephone visit. I thought that was awesome of the doctor to go out of her way to keep my appointment because I really need to see her but I couldn’t
Ken Hance
Ken Hance
17:20 27 Jan 22
Professional and a very personable experience. I HIGHLY recommend DeMera Allergy!
Michael Crowley
Michael Crowley
17:10 18 Feb 22
Dr. Sherman is AMAZING!!
Anahi Delacruz
Anahi Delacruz
17:48 27 Aug 21
I have dealt with chronic coughing for 16 months. Dr Demera is searching for the cause, not just throwing antibiotics and prednisone at it. I appreciate him taking it seriously.I enjoy walking in to office and hearing the staff enjoying each other.My appointments are always on also.I highly recommend Dr. Demera and his staff.
Mary Enos
Mary Enos
17:57 03 Dec 21
The staff and Dr. De Mera were professional and attentive.
Merv Barcellos
Merv Barcellos
17:28 03 Mar 22
It was wonderful. Staff is always kind and efficient.
Carolina Gustafson
Carolina Gustafson
21:27 08 Apr 22
The team at DeMera Allergy Asthma are so nice and extremely organized. Dr. DeMera has a really neat personality and puts his patients at ease.
Patricia Wilkinson
Patricia Wilkinson
01:31 02 Mar 22
Great experience for my first time visit to Dr. Demera's office. I felt very welcomed and very well cared for by the doctor and his staff.
Kelly Swertfager
Kelly Swertfager
16:24 12 May 22
I have been a patient of Dr. Demera for a few years and recently had the good fortune to become one of Dr. Sherman’s patients as well. Both doctors are competent, professional and personable. I have never been made to feel as if my questions are an imposition (I ask a LOT of questions), and I always get honest answers that make sense. Dr. Sherman is enthusiastic, obviously loves the work he does and cares about his patients as people, not dollars orminutes in an hour.
Mallory Moad
Mallory Moad
16:47 06 May 22
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
Friendly office staff!! Office cleanliness is super clean!
Bill Whelan
Bill Whelan
17:33 06 Jan 22
Jennifer is the best, polite, calm & funny.
Cindy Farris
Cindy Farris
17:46 04 Jan 22
Friendly staff and knowledgeable Doctors. Dr Ruch is fantastic!
kris kachadoorian
kris kachadoorian
17:53 21 Dec 21
Friendly, caring, and intelligent!
J L
J L
16:33 23 Jul 21
Dr Demerara was very understanding of my concern and gave a very good explanation of cause and treatment plan.
James Hiney
James Hiney
17:39 03 Feb 22
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
Dr. Demera is connected, brilliant, and caring. He listens, which is first and foremost in any patient care. Jessica, his NP/PA is the same. What a team. The staff is also receptive, kind, and willing to share a laugh or two. Very grateful for this place. ~ R. Reilly
Crazy Lady
Crazy Lady
17:55 04 Nov 21
Very professional and excellent service.
Torigian Law
Torigian Law
18:43 02 Nov 21
Wonderful as always! Always on time, very thorough and pleasant.
Lindsey Bills
Lindsey Bills
05:01 10 Jan 22
I'm always impressed and thankful I found them.
Jason Thomas
Jason Thomas
16:55 12 Nov 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
17:55 11 May 22
Great experience! Ms Jessica was so nice and eager to help me reach a resolution to my allergies. She explained the test I took well! She also ordered tests that had never been ordered before in attempt to get to the bottom of my allergies. I feel I'm in great care!
Elaine Alvarez
Elaine Alvarez
16:13 07 Apr 22
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