Kathryn Lindsey McMullan MD

Kathryn Lindsey McMullan MD Allergy, Asthma, and Immunology Specialist at Mississippi Asthma & Allergy Clinic PA Kathryn L. Louis, MO at Barnes Jewish Hospital.

McMullan MD is an allergist and immunologist at the Asthma & Allergy Clinic of Hattiesburg. She is board certified by the American Board of Allergy and Immunology (ABAI) and the American Board of Internal Medicine (ABIM). She completed medical school and her internal medicine residency at the University of Mississippi School of Medicine. She completed her allergy and immunology fellowship at Washi

ngton University School of Medicine in St. She is a member of state and regional allergy societies including: MSAAI and SEAAI, and a fellow of national allergy societies, AAAAI and ACAAI. Dr. McMullan sees patients of all ages. She sees asthma, a variety of allergic diseases including: allergic rhinitis (Hay fever), sinusitis, drug allergy, bee and ant allergies, hives, angioedema, eczema and food allergy. She also sees immune deficiencies. She has a particular interest in allergic diseases and asthma in pregnancy. For appointments call 601-268-5051. Medical questions and concerns will not be addressed through this page or associated email. For a life-threatening emergency, please call 911.

06/12/2026

Meet Brandy, the biologics nurse at our Hattiesburg office!

With a love for helping others and a mom in nursing, Brandy always knew she wanted to be a nurse and has now been a MSAAC nurse for 4 years. When Brandy was in nursing school, she was selected as the recipient of the Nightingale Award for demonstrating exceptional patient care, leadership, and clinical performance.

Outside of work, you’ll find her spending time with her kids and family and embracing the outdoors with activities such as four wheeler riding alongside her boyfriend.

We are so grateful to have Brandy on our Hattiesburg team!

06/05/2026

We know asthma and allergies can keep kids from being kids and that treatment can be nerve wracking for children. Our doctors and nurses provide a comfortable and safe environment for children to get the diagnoses and treatment they need to thrive.

Take advantage of summer break and book an appointment today by calling one of our 8 clinics or visiting https://www.msaac.com/

05/15/2026
05/06/2026

May is National Asthma and Allergy Awareness Month. Take control of your asthma and allergies by connecting with an allergist/immunologist. Find a specialist near you https://ow.ly/j0Is50YTFl0.

05/06/2026

Tick season is here and it’s already hitting harder than usual. According to the CDC, ER visits for tick bites are higher than normal across most of the country, reaching the highest levels for this time of year since 2017. But beyond the immediate bite, there’s a lesser-known risk that more people need to understand: alpha-gal syndrome.

"Alpha-gal syndrome is a serious and poorly understood food allergy that can develop after a tick bite. In some people, the bite triggers an immune response to alpha-gal, a carbohydrate found in mammalian-derived products. These include meats such as beef, pork, mutton as well as gelatin, bouillon, dairy products and even ingredients in some medications. AGS can be challenging to diagnose because reactions may appear hours after eating, making it difficult to identify the cause.

We’re working to raise awareness of alpha-gal syndrome because many people report living with this disease for months before receiving a proper diagnosis. A 2022 CDC report found that nearly half of healthcare providers are unaware of this syndrome. It’s critical that we bridge this awareness gap so individuals and families can get the care and support they need." - Sung Poblete, PhD, RN, CEO of FARE

Prevention matters. Wear insect repellent, check for ticks after spending time outdoors, and remove any attached ticks as quickly as possible. Awareness is just as critical, because when it comes to alpha-gal syndrome, delayed reactions and low recognition can leave people searching for answers for far too long.

Learn more about alpha-gal syndrome here: https://www.foodallergy.org/resources/alpha-gal-syndrome

01/26/2026

Due to inclement weather, our Starkville and Oxford clinics will be closed tomorrow. The Oxford clinic will also be closed on Tuesday. The Ridgeland, Hattiesburg, and Jackson clinics will delay opening until noon on Monday and the Meridian clinic will open at 1PM.

We will continue to monitor conditions and will share updates if any additional locations are affected.

Everyone please stay warm and safe!

12/18/2025
10/17/2025

Meet Cheree! Cheree works in our mixing lab, creating custom immunotherapy for all of our 8 clinic locations! She was drawn to her position because of the custom patient care that she is able to provide. Did you know that Cheree has lived in 8 states? Cheree, we’re so glad you call Mississippi and MSAAC home!

This is a great explanation of alpha-gal allergy!
07/04/2025

This is a great explanation of alpha-gal allergy!

03/12/2025

As spring approaches, Mississippians eagerly anticipate sunnier weather and outdoor activities—but for many, this season also signals the return of relentless seasonal allergies. The specialists at Mississippi Asthma & Allergy Clinic are urging residents to recognize the early signs of allergies and seek professional treatment to manage symptoms effectively.

You can read the full release here: https://conta.cc/41E2A3r

Address

3720 Hardy Street Ste 20
Hattiesburg, MS
39402

Telephone

+16012685051

Website

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