Ashburn Allergy PLLC

Ashburn Allergy PLLC

A medical clinic located in Ashburn, VA that specializes in allergic disorders. Dr. Jiun Yoon is a board-certified adult and pediatric allergist.


Happy Veterans Day! Thank you to all the wonderful men and women who served including our very own Dr. Yoon.

We will be closed this Friday, July 3rd for the Fourth of July holiday!

[05/27/20]   Effective Friday, May 29, 2020
Per Gov. Northam's mandate; facial coverings or masks will be REQUIRED of all patients and family members at all times in the clinic. We will also be conducting temperature and symptoms screenings of all patients.

We will be closed on Memorial Day, Monday, May 25th!

Traditionally, the peak tree pollen counts fall in between the last two weeks of April and the first two weeks of May in the Metro DC area. With all the cold wet weather we have had over the last couple of weeks, the trees in the area have not had a chance to release their pollen. Starting today, temperatures are going to be in the upper 60s and continue over the next couple of days into the 70s with generally dry conditions with a slight breeze. The weather is ideally suited for the maximum release of pollen. Don't be surprised if you wake up to your car covered in a fine yellow dust tomorrow or Sunday.
With the warmer and drier weather, people cooped up in their homes will likely venture outdoors. With the increased tree pollen in the area, those people with seasonal allergies are likely to have a significant increase in their symptoms, especially if they have not been using their allergy medications or have stopped receiving their allergy shots.
With COVID-19 also ongoing, some allergy symptoms can be confused with COVID-19 symptoms. Although both conditions can have sneezing, coughing, congestion, and shortness of breath; typically allergy symptoms are also associated with increased itchy symptoms (eyes, nose, throat, and skin), and usually are not associated with fever, chills, dark discharge, body aches, or abdominal symptoms.
We are open (albeit with extra precautions) and seeing new and established patients of all ages to help you with your seasonal and year-round allergy symptoms. Call now to schedule your appointment or to answer any questions. We also offer televist appointments if needed. or call (571) 246-6323

Found this on another page. Be careful when making homemade cleaning wipes, etc.

[04/25/20]   My staff thinks my posts are too long, so I'll keep this one simple and short.

DO NOT inject, ingest, or otherwise use cleaning products in any way other than what is listed on the directions of use. Also do not purposely expose yourself to any UV or other intense light in hopes of curing or preventing COVID-19.

Is the Virus on My Clothes? My Shoes? My Hair? My Newspaper?

This article has excellent practical information and answers about questions people have about the coronavirus and how the respiratory droplets can and can not cause infection. We asked the experts to answer questions about all the places coronavirus lurks (or doesn’t). You’ll feel better after reading this.

[04/17/20]   Spring allergy sufferers, we are heading to the heart of the Spring Allergy Season. Traditionally in the Metro DC area, the peak tree pollen counts are measured anywhere between the start of the 3rd week of April to the end of the 1st week in May. A clear visual cue is the layer of yellowish film on your cars.

Normal, tree pollen is microscopic and not visible to the unaided eye without a magnifying glass or microscope. However, during the peak, there are so many pollen granules in the air that the individual pollen grains clump together so that they become visible to the naked eye. Traditionally, the biggest contributor to the pollen counts during these times is oak tree pollen. Oak pollen accounts for greater than 50% of the pollen count in any given year including trees (Spring), grasses (Summer), and weeds (Fall).

Those masks that people are currently wearing for the COVI-19, have a dual purpose now as it may help to reduce how much pollen they are exposed to when outdoors. Also remember to use your allergy medications including antihistamines pills, nasal sprays, and eye drops. Aeroallegen immunotherapy or "allergy shots" are also very effective in reducing your need for medications over time.

We are open as usual, albeit with extra COVID-19 precautions and procedures, to answer your questions, help you determine if and which environmental allergens are causing your symptoms and also to tailor a treatment plan within your budget and time constraints. We offer in-office and/or televisits for your convenience.

Call us at (571) 246-6323 or visit us at

[04/09/20]   We previously published a post about wearing masks/facial coverings in public. The CDC is now officially recommending that people should wear a facial covering when out in public, especially in public indoor areas. Again, please save the N95 and surgical masks for the healthcare personnel. Facial coverings are very effective in helping to prevent you from touching your face with contaminated hands. Social distancing and staying six feet away from those respiratory droplets will also go a long way in preventing person to person transmission.

There are a lot of people also wearing gloves. Gloves can be effective in a place like the gas station. You wear the gloves to pump gas and throw them in the trash immediately after use without touching other objects. Wearing gloves in other situations may not be ideal. Wearing gloves can give you a false sense of protection as you think you are protecting your hands but everything your gloved hand touches is potentially contaminated. If you then proceed to touch other objects (your face, phone, glasses, steering wheel, etc) those objects are now also contaminated. Replacing your gloves each time you touch something is also not practical. The best way to keep your hands clean is by frequent handwashing with soap and water. If that is not immediately available then the next best option is using hand sanitizers and/or wipes to clean off commonly touched surfaces. Remember also to decontaminate your commonly touched objects, especially your cell phone.

[04/03/20]   To mask or not to mask? There is a lot of coverage about the shortage of personal protective equipment (PPE) including N95 respirators masks and surgical masks for healthcare and other frontline personnel helping to combat COVID-19 and are directly exposed to patients with COVID-19. Recently there has also been coverage about whether or not the general public should wear masks/facial coverings when they are in public places.
First some basics about transmission. The most recent understanding among the public health officials and others monitoring the spread of COVID-19 is that COVID-19 is transmitted via contact with respiratory droplets of an infected person. This can be in the form of direct contact from an infected person who sneezes, cough, or otherwise directly exposes an uninfected person. Remember though that not every sneeze or cough from an infected person will cause transmission of the virus to the exposed person. Transmission can also occur via touching a surface that has the infected respiratory droplets then touching your own mouth, eyes, or nose. Viruses can only replicate inside a living cell, so when they are in those respiratory droplets and get on surfaces, the virus rapidly degrades. There have also been reports about how long the virus can stay on any given surface with variability depending on the surface. Anywhere from up to 72 hours on glass, steel, plastic, and countertops to up to 24 hours on cardboard, fabric, or paper. Those times should be taken in the context that although you can measure the presence of a virus on a surface it does not necessarily mean that the virus will cause disease. Quantity and how rapidly environmental factors degrade those viruses largely determines their infectivity.

Hand washing and avoiding touching your face (mouth, nose, and eyes) with social distancing and avoiding crowded public spaces is still the best guard against exposure to this coronavirus (SARS-CoV-2). That is why MD, VA, and DC and other states have stay at home orders and guidance to avoid congregating in large groups. Social distancing has worked in the past with previous pandemics and is working to reduce transmission rates during this pandemic. The stay at home orders are not an isolation order so exercising outside or taking your dog for a walk is allowed and recommended with limitations, just avoid crowds or large groups.

N95 respirator masks and equivalents really should be reserved for those healthcare workers who are treating known infected patients in hospitals and clinics. Masks and the better term facial coverings may be helpful in guarding against touching your mouth, nose, and eyes while in public and also helps reduce the spread of those respiratory droplets in asymptomatic infected persons who may be out in the public. The concern about advising all persons to wear facial coverings in public is that public health officials do not want to give the public a false sense of security that wearing a facial covering is going to absolutely protect them from contracting the virus. Wearing a facial covering in public does not negate the need to continue with frequent hand washing and social distancing practices. Any form of facial covering will work, it does not have to be a surgical mask or N95 respirator mask.

[04/02/20]   We are still open as usual for visits and allergy shots. We have been fortunate thus far that walk-in shot patients have not been coming in bunches so there are generally no more than 2-4 shot patients at any one time in the waiting room. Thus we have not had to implement scheduled shot visits yet. If you are concerned, please feel free to call ahead before coming in. We have also activated telehealth visits through our patient portal, HEALOW app. Please call if you are interested in a new or established patient visits via video conferencing. We are still working out the clinks so please be patient with us if you choose that route. Again as a friendly reminder, if you have a fever, cough, shortness of breath, cold or URI symptoms or are asymptomatic but have had contact with someone who is sick, we ask you to stay home. (571) 246-6323

Allergy Doctor Serving Ashburn

With the COVID-19 pandemic in our daily thoughts, it's easy to forget that we are also in the Spring allergy season. In addition to doing all the COVID-19 precautions of washing hands, not touching your face, and social distancing, remember to continue to make sure your existing health conditions are well maintained and managed. For our allergy and asthma patients that includes using her asthma inhalers and daily controller medications, nose sprays, and antihistamines.

Sunny, warm, and dry days with a breeze like today are perfect for spending some time outdoors but for our allergic rhinitis and allergic asthma patients, those conditions are also perfect also for the trees to release tons of allergic pollen in the air.

Long-acting antihistamines such as Allegra(fexofenadine), Zyrtec(cetirizine), Claritin(loratadine), and Xyzal(levocetirizine) help with some of the itchy symptoms.

Intranasal corticosteroid sprays such as Flonase and Flonase Sensimist(fluticasone), Nasacort(triamcinolone), Rhinocort(budesonide) are very effective for the congestion symptoms (stuffy nose, runny nose, post-nasal drip, and cough).

Eye drops such as Zaditor or Alaway are also effective in helping for the itchy, watery eyes.

A combination of all three may be required for some patients to control their symptoms. The single best medication is the nasal spray but it needs to be used every day to be effective, as they generally take about 7-10 days to give you the full 24-hour benefit of using them.

[03/25/20]   We have had a lot of questions about asthma and COVID-19. Having asthma does put a patient at increased risk of getting a more severe illness from the novel coronavirus as COVID-19 can affect the lungs and cause pneumonia and acute respiratory distress. However, having asthma does not guarantee a bad outcome nor does it increase the chances of contracting COVID-19. All asthmatics should continue to be proactive in managing their asthma. Make sure you have an adequate supply of your asthma medications, both daily controller and rescue medications. Take your medications as directed. If the asthma is well controlled and you are mitigating risk factors then your risk of contracting the virus should be no worse than that of the general population. As with all patients, the key for asthmatics is preventing exposure to the virus and not getting sick in the first place. Practice social distancing (six feet of space and avoiding large groups of people), frequently wash hands with soap and water (hand sanitizers are an option if soap and water are not available), and avoid touching your face (especially mouth, nose, and eyes)after touching potentially contaminated surfaces. Masks are a good way to prevent yourself from touching your face. For this purpose, any type of mask will do. Using masks and specifically N95 masks to prevent spread of the virus are for patients who are sick and/or for healthcare workers who are caring for sick patients as those healthcare workers have direct exposure to aerosolized respiratory droplets. Masks will not necessarily prevent exposure in patients who are healthy; but again they are a good way to prevent you from touching your face with contaminated hands.

[03/19/20]   Under the current situation with the COVID-19 pandemic in order to serve the greatest number of patients, if you have a cold/respiratory infection or any of the following symptoms, PLEASE CALL the clinic before coming for your appointment or visit at (571) 246-6323:
1. Fever (Temperature >100.4 F)
2. Cough
3. Shortness of breath

If you have any of those symptoms or have been diagnosed with an upper respiratory illness or have cold symptoms, we ask that you NOT get your allergy injections until your symptoms have completely resolved. If you have an appointment we can reschedule the appointment.

Sorry for the inconvenience and thank you for your understanding.

Ashburn Allergy PLLC

Dear Ashburn Allergy Family,

UPDATE 03/18/2020

As everyone is aware, the number of cases is growing in the United States. It is concerning but not unexpected as more testing kits are made available and patients are tested, the numbers of positive cases are expected to climb. However, with all the social distancing measures enacted locally and nationwide to limit community spread, the numbers will eventually come down.

It is the start of the Spring allergy season and we know our allergy patients are having symptoms and need our services. Until told otherwise, we will continue to stay open and provide the same level of care that you have come to expect from us. Since schools have closed and many employers have encouraged teleworking, we have not had any issues currently with the number of patients in the clinic at one time. We plan to continue to have walk-in allergy shot hours but occasionally may have to tell patients to come back at another time if there are too many patients in the waiting area. If there are others in the waiting room, please practice the recommended social distancing of 6 feet. We are asking patients and parents to limit who comes to the clinic to only those that need to be here for the appointment. We may eventually also temporarily implement scheduled appointments for injections. Feel free to call the clinic prior to coming in for the current number of patients in the waiting area.

We ask our existing patients to hold off on allergy shot and follow-up visits if you or a close family member actively has an upper respiratory infection or other infectious symptoms to include but not limited to fever, cough, shortness of breath, body aches, chills, nausea, vomiting, diarrhea, sputum production (colored and/or thick secretions). Please do not hesitate to call the clinic first to discuss your symptoms before coming into the clinic.

If you suspect that you may have exposure to COVID-19 or exposed to a person with a diagnosis of infection with COVID-19, or recently traveled from any known area with widespread community transmission of COVID-19 including the hotspots in the US and develop upper respiratory infection symptoms (especially fever, cough and shortness of breath) then testing is warranted. Call your primary care provider or local urgent care/ER to get instructions for obtaining the testing. DO NOT just show up at those locations.
If you are sick and have confirmed or suspected COVID-19 and have been directed to isolate at home, you can stop home isolation under the following conditions:
• You have had no fever for at least 72 hours (that is three full days of no fever without the use of medicine that reduces fevers) AND
• Other symptoms have improved (for example, when your cough or shortness of breath have improved) AND
• At least 7 days have passed since your symptoms first appeared.
We have increased our cleaning and disinfecting frequency in the waiting area (all potential contact surfaces) and all clinical areas. We have also temporarily removed all magazines and the child’s play area items as an extra precaution. If you would like to disinfect a chair prior to sitting, we do have limited supplies of cleaning wipes available. Please do not hesitate to ask. We also have hand sanitizers placed around the clinic.

We will continue to keep you updated via emails through the patient portal. Also, we update the notification bar on the website and will also post updates on our page.

Like us on Facebook to keep updated on the latest news.

Ashburn Allergy website:
CDC website:
VA Health Department website: www.vdh.virginia/gov/coronavirus

All of us at Ashburn Allergy

A medical clinic located in Ashburn, VA that specializes in allergic disorders. Dr. Jiun Yoon is a board-certified adult and pediatric allergist.

A New Beginning!

Officially open for patients as of April 9, 2018!!

Welcome to Ashburn Allergy, PLLC. We are a pediatric and adult allergy, asthma, and immunology clinic located in the heart of Loudoun County. We strive to provide the most advanced and comprehensive evaluation and treatment for your entire family. We welcome patients of all ages. Here at Ashburn Allergy, every patient is cared for like family and we want you to be involved in your care and well-being. We use the most current evidence-based medical guidelines and clinically proven state of the art testing and evaluation methods to develop a personalized treatment and care plan individualized to each patient’s needs.

Jiun Yoon, MD started his own solo allergy practice, Ashburn Allergy, PLLC, after eleven years of government service and six years in a group private practice. He served nine years on active duty with the United States Army. During his distinguished nine-year Army career, Dr. Yoon served as a Brigade Surgeon in the 2nd Infantry Division, staff internist with the 8th Army based in Seoul, South Korea, and Chief of the Allergy and Immunology Service at Dwight D. Eisenhower Army Medical Center in Augusta, Georgia; including a deployment in support of Operation Iraqi Freedom with the 10th Combat Support Hospital. After completing his active duty service, Dr. Yoon practiced at the Fort Belvoir Community Hospital as a civilian allergist and also contributed to the education of future allergists at the Walter Reed National Military Medical Center Allergy and Immunology training program. Prior to starting Ashburn Allergy, Dr. Yoon joined a large group allergy private practice in the Metro DC area and served as the lead physician for their hub. He completed his undergraduate training at the University of Michigan in Ann Arbor and earned his Doctor of Medicine from the Drexel University College of Medicine in Philadelphia. He completed his internship and residency in Internal Medicine at Tripler Army Medical Center in Honolulu, HI and fellowship training in Adult and Pediatric Allergy and Immunology at the prestigious Walter Reed Army Medical Center. He is board certified in Allergy/Immunology.

Dr. Yoon's professional career includes appointments on several committees appointed by the American Academy of Allergy Asthma and Immunology (AAAAI) and the American College of Allergy Asthma and Immunology(ACAAI). He has also been elected as a Fellow of both the AAAAI and the ACAAI, as well as the American College of Physicians.



20955 Professional Plaza Ste 300
Ashburn, VA

Opening Hours

Monday 10:00 - 18:00
Tuesday 07:30 - 14:30
Wednesday 10:00 - 18:00
Thursday 10:00 - 18:00
Friday 07:30 - 14:30
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