About Us Allergy & Asthma Center of Duncanville
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Allergy & Asthma Center of Duncanville is a fully staffed multi-physician group specializing in allergy and asthma treatments.
Harold Delasalas, MD, PharmD, MBA FAAP, FACP, FAAAAI, FACAAI
Dr. DelasAlas’s journey in healthcare began in the Houston suburbs, where he was inspired by his parents, both dedicated nurses, to pursue a life of service to others. With a strong foundation in healthcare, he earned his Doctorate in Pharmacy with high honors from the University of Houston at just 23 years old. Driven by a passion for advancing his expertise, he graduated second in his class from the University of Texas Medical Branch, where he was inducted into the prestigious Alpha Omega Alpha Medical Honor Society.
Dr. DelasAlas received advanced training through a rigorous residency in Internal Medicine at Washington University in St. Louis/Barnes-Jewish Hospital, one of the nation’s most esteemed programs. He then pursued subspecialty training in Allergy and Immunology at Creighton University under the mentorship of Dr. Thomas Casale, a renowned leader and researcher in the field.
Dr. DelasAlas recently earned an MBA with highest honors from the University of Illinois Gies College of Business, with added specialization in Business Analytics. This unique training equips him to lead with innovation and efficiency in today’s complex healthcare environment. He has earned his certification in Healthcare Compliance, which allows him to ensure medical operations align with the legal, ethical, and regulatory standards while maintaining high quality patient care.
Dr Delasalas has been accepted into a Juris Doctorate program to start in Fall 2025, enhancing his ability to navigate the intersections of medicine, business, and law to benefit his patients and practice. Since 2014, Dr. DelasAlas has proudly served the community as part of the Allergy and Asthma Center of Duncanville, where he became Medical Director in 2015 and Chief Medical Officer in 2024.
His leadership is dedicated to delivering compassionate, evidence-based care and fostering a patient-first approach. Dr. DelasAlas is recognized nationally for his expertise. He holds Fellowship status in the American College of Physicians, the American College of Allergy, Asthma, and Immunology, the American Academy of Pediatrics, and the American Academy of Allergy, Asthma, and Immunology. He is also an active member of the American Association for Physician Leadership, the American Health Law Association, and the Health Care Compliance Association. Outside of work, Dr. DelasAlas enjoys spending time with his family and friends. His dedication to his patients and the community makes him a compassionate, trusted advocate for your health and well-being.
Jesse Astorga, MPAS, PA-C
Jesse Astorga is a board-certified Physician Assistant who joined Asthma and Allergy Center of Duncanville in 2020. He graduated from Louisiana State University Health Science Center with his Master of Physician Assistant Studies. He is a native Texan and completed his undergraduate degree in Biology at Texas Tech University. He decided to specialize in Allergy and Immunology to help patients improve their quality of life as he has first-hand experience of what it is like to battle with allergies since childhood. In his spare time, Jesse enjoys being outdoors, watching his favorite sports teams, and refining his culinary skills. Jesse looks forward to meeting you and your family!
Fanta Suwaneh, MPAS, MPH, PA-C
I was born and raised in Gambia, West Africa. I came to the United States in 2009 to further my education, I attended Rust College in Mississippi and graduated with a Bachelor of Science in Biology. I also have a Master’s in Public Health from the University of Memphis. Prior to PA school, I worked as a Clinic Assistant at the Church Health Center in Memphis, TN. I also worked at the West Cancer Center as a Breast Cancer data analyst. I went to the University of Tennessee’s Health Science Center Physician Assistant program in Memphis, TN, and graduated in 2020.
I am passionate about helping people with allergies and asthma, as I myself and my son suffer from allergies and I know how they can affect our daily lives.
In my free time, I love traveling with my family, watching documentaries about different cultures, and watching food shows.
Christina Bishop, MPAS, PA-C
Christina Bishop is a board-certified PA with experience in Family Medicine who joined the practice in 2025. She graduated with a Bachelor’s degree in biochemistry from the University of Texas at Dallas in 2019 before training at the University of North Texas Health Sciences Center, where she graduated with a Master’s of Physician Assistant Studies with Honors in 2024. She is passionate about the treatment of allergies and asthma because both her brother and husband are affected by them and she has seen the difference that quality treatment can make in people’s lives. In her free time she enjoys reading, crocheting, painting, and spending time with her husband and her dog.
Kevin Nguyen, MPAS, MPH, PA-C
Kevin Nguyen is a board-certified Physician Assistant, with experience in Emergency/Primary Care medicine, who joined Asthma and Allergy Center of Duncanville in 2020. Kevin is a graduate from AT Still University School of Osteopathic Medicine with a Master of Science in Physician Assistant Studies in 2019. Kevin is from Arlington, Texas, where he completed his Bachelor of Science at University of Texas at Arlington and Master of Public Health in Epidemiology at University of North Texas Health Science Center in Fort Worth, Texas.
Stephanie Pham, MPAS, PA-C
Meet Our Staff
Lori, Office Manager
Idcel, Front End Specialist
Ariana, Front End Specialist
Julissa, Front End Specialist
Adriana, Front End Specialist
Rocio – Lead IT Specialist
Kevin, Lead IT Specialist
Delores, Certified Medical Assistant
Judith – Medical Assistant
Hometown:
GLENN HEIGHTS, TEXAS
Jackie – Medical Assistant
Hometown:
DUNCANVILLE, TEXAS
Albert, Virtual Registered Nurse
Lawrence – Virtual Assistant
Hometown:
CAVITE, PHILIPPINES
Irish, Virtual Registered Nurse
Stephanie, Billing Specialist
Hometown:
DALLAS, TEXAS
Melanie, Clinical Specialist
FAQs: What is a PA?
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PA education and practice emphasize patient education, preventive care, and chronic care management. PAs’ generalist medical training enables them to provide a wide spectrum of patient care and treat the “whole patient.” PAs make it easier for patients to get the care they need when they need it.
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PAs are medical professionals who diagnose illness, develop and manage treatment plans, prescribe medications, and often serve as a patient’s principal healthcare provider. With thousands of hours of medical training, PAs are versatile and collaborative. PAs practice in every state and in every medical setting and specialty, improving healthcare access and quality.
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PAs are educated at the master’s degree level. There are more than 250 PA programs in the country, and admission is highly competitive, requiring a bachelor’s degree and completion of courses in basic and behavioral sciences as prerequisites. PA programs are approximately 27 months (three academic years) and include classroom instruction and more than 2,000 hours of clinical rotations.
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A PA’s medical education and training are rigorous. The PA school curriculum is modeled on the medical school curriculum that involves both didactic and clinical education training. In the didactic phase, students take courses in basic medical sciences, behavioral sciences, and behavioral ethics. In the clinical phase, students complete more than 2,000 hours of clinical rotations in medical and surgical disciplines, including family medicine, internal medicine, obstetrics and gynecology, pediatrics, general surgery, emergency medicine, and psychiatry.
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PAs’ specific duties depend on the setting in which they work, their level of experience, their specialty, and state laws. Generally, PAs can:
- Take medical histories
- Conduct physical exams
- Diagnose and treat illness
- Order and interpret tests
- Develop treatment plans
- Prescribe medication
- Counsel on preventive care
- Perform procedures
- Assist in surgery
- Make rounds in hospitals and nursing homes
- Do clinical research
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There are more than 123,000 PAs who practice in every medical setting in all 50 states and the District of Columbia. They work in hospitals, medical offices, community health centers, nursing homes, retail clinics, educational facilities, workplace clinics, and correctional institutions. PAs also serve in the nation’s uniformed services and work for other federal government agencies, such as the Department of Veterans Affairs.
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PAs are committed to team practice with physicians and other healthcare providers. Currently, most state laws require PAs to have an agreement with a specific physician in order to
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Yes. The PA profession is one of the fastest growing in the country. The U.S. Bureau of Labor Statistics projects that the profession will increase 37 percent from 2016 to 2026, significantly faster than the average for all occupations. The demand for PAs is so high that three-quarters of PAs receive multiple job offers upon graduation.
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PAs are trusted healthcare The survey found that 93 percent regard PAs as trusted healthcare providers, and 91 percent believe that PAs improve the quality of healthcare.
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At the practice level, there are likely more similarities than differences between PAs and NPs. However, there are two key differences:
- PAs are educated in general medicine, which offers a comprehensive view of all aspects of medicine. NPs must choose a “population focus,” e.g., pediatric nurse practitioner or women’s health nurse practitioner.
- PAs are trained to practice medicine using a curriculum modeled on medical school education. NPs are trained in the advanced practice of nursing.
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