COVID-19 Vaccine

We have received numerous questions over the past several weeks regarding the Covid vaccines, and we will try to address most of them in this post. We have compiled this information from different sources which are listed at the end of this piece. Please note, the Pfizer and Moderna COVID-19 vaccines are some of the safest and most effective vaccines for an infectious disease. These vaccines will end this pandemic if almost every human around the world is inoculated.


Will our practice (Allergy, Asthma & Food Allergy Centers) receive vaccines to immunize our patients?

As of 4/28/21, we will NOT as the mRNA approved vaccines require extremely cold temperatures (-70°C or -94°F for Pfizer; -20°C or -4°F for Moderna) for storage, and there is now good access for the general population (except most kids) to receive all 3 approved vaccines.


I have allergies (to foods, drugs, pollens, etc.). Am I at risk for a severe allergic reaction to the vaccine?

If you have an allergy to polyethylene glycol or some injectable medications, you may be at risk, but food allergies, drug allergies to oral medications, and environmental allergies do not put you at any significant risk over the general population. You will also be monitored for at least 15-30 minutes after vaccination, and vaccination sites should have epinephrine on hand on the off chance you have a reaction. Remember, no one has died from Covid vaccination despite millions of doses and as of this post, over 400,000 people have died due to COVID in the US.

There was a recent CDC  report with 71% of anaphylaxis cases being in the first 15 min. Anyone with an anaphylactic history can and should wait 30 mins. 

There is currently no validated testing for suspected allergy to polyethylene glycol or for other components of the vaccine. You can find more information here: American College of Allergy, Asthma & Immunology (ACAAI) Guidance on Risk of Allergic Reactions to mRNA COVID-19 Vaccines.

Remember, allergic reactions to the vaccine are relatively infrequent; roughly one in every hundred thousand injections — more than 100 times less common than allergic reactions to penicillin. Reactions are being observed because so many people are being immunized. Importantly, everyone who has had a reaction has been effectively treated and stabilized without any long-term problems.

Large local reactions have been reported, especially after Moderna vaccines, including:

  • Itching, redness, and swallowing are not uncommon. This comes on late (>5 days from vaccination) and can last for weeks. Treatment is symptomatic: antihistamine, NSAIDs (like ibuprofen)/Tylenol, ice. You CAN still get the second dose! In the Moderna vaccine trial, delayed large locals like these occurred 4 times less with the 2nd dose than the 1st dose.
  • Consider switching to the other arm for the second dose if you had a local reaction to the first dose.
  • These large local rxns are all very delayed in onset (often after day 8) so mechanistically they are different from immediate reactions.


I’ve heard that the vaccines are made from fetal tissue. Is this true?

NO, the Pfizer and Moderna vaccines are synthetic- made from chemicals. The AstraZeneca (AZ) vaccine (not approved as of 1/25/21) does use an immortalized cell line (HEK 293) derived from an abortive fetus from the 1960s for vaccine production. Here is a commentary that discusses this.


Where can I get information on how to get the Covid vaccination?


How do the Covid vaccines work?

COVID-19 vaccines help boost the immune system against the pandemic-causing SARS-CoV-2 virus. As of 1/25/21, two COVID-19 vaccines are available in the U.S. One by Pfizer/BioNTech and the other by Moderna.  Both of these utilize messenger RNA (mRNA) to make the spike protein found in the SARS-CoV-2 virus, which attaches to human cells leading to infection. The spike protein stimulates the immune system to make antibodies against this virus, making a person less susceptible to contracting it. Having antibodies against the spike protein can prevent the virus from attaching and infecting human cells.  Both vaccines require two doses, three or four weeks apart in order to achieve an optimal immune response.


Are there any safety concerns with the new technologies (mRNA and nanotechnology) being used in the development of COVID-19 vaccines?

There are no known additional risks of mRNA vaccines or lipid nanoparticles. Live attenuated viral vaccines, such as the measles vaccine, induce an immune response that is similar to natural infection. mRNA vaccines, on the other hand, simply give the body instructions to produce one very specific part of a virus – in this case the spike protein – to then induce an immune response.  Because mRNA is broken down very quickly in the human body, it is wrapped in a lipid nanoparticle to be able to get into our cells to do its work. Once it gets into the cells to deliver the instructions, the mRNA breaks down very quickly. There are rumors that mRNA vaccines will alter DNA because the RNA molecule can convert information stored in DNA into proteins. That is not true. It is important to note that the mRNA vaccines never enter the nucleus of the cell, where DNA is stored. After injection, the mRNA from the vaccine is released into the cytoplasm of the cells. Once the viral protein is made and on the surface of the cell, mRNA is broken down and the body permanently gets rid of it, making it impossible to change DNA.

This is a nice set of tweets from Andrew Nowalk, MD, Ph.D., a pediatric infectious disease specialist in Pittsburgh. He presents some information on the vaccines that may alleviate some concerns people have about the speed at which the vaccines were developed. They are presented below (but here is a link to his tweets).

  • This is NOT a vaccine created in 9 months. The origin goes back many years.
  • The first reports of an mRNA vector in a lipid particle used as a transfer vehicle go back to 1989 at the Salk Institute. Vaccines were considered using this in the 1990s. Kariko and Weissman made a big leap forward in 2005.
  • They modified the nucleosides of the mRNA, the building blocks that encode the viral protein so that they would be recognized as host RNA and properly translated.
  • Moderna (ever notice the last 3 letters) started in 2010 to expressly use this technology.
  • The first vaccines of this variety are NOT against #COVID it was MERS and OG SARS. Those trials are more than 3 years old.
  • The real analog here is 2009. That’s when we took the pandemic H1N1 strain and made a vaccine with it in 6 months. That’s a good analogy.
  • When this vaccine technology and development started, REM and Nirvana were the big bands, Clinton was president, and an i-anything from Apple was more than half a decade away.

Risk of Covid vaccine in context by Aaron E. Carrol, M.D., who is a professor of pediatrics at Indiana University.


What about Covid-19 vaccination in pregnancy?

Please contact your OBGYN to see what his/her current recommendations are.  Most OBs are recommending it for pregnant and nursing mothers.  The Centers for Disease Control and Prevention (CDC), the American College of Obstetrics and Gynecology (ACOG), and the Society for Maternal-Fetal Medicine agree that the new mRNA COVID-19 vaccines should be offered to pregnant and breastfeeding individuals who are eligible for the vaccine. Here is a piece on the Covid vaccine in pregnancy.

More recently, preliminary findings of a study published in the New England Journal of Medicine on 4/21/21 find COVID-19 mRNA vaccines made by Pfizer and Moderna are safe for pregnant women. A study in JAMA Pediatrics found pregnant women who became infected with the virus were at increased risk for maternal mortality, preeclampsia and preterm birth. Therefore, it is particularly important for those who are pregnant to receive the COVID vaccine, and the CDC now recommends that all pregnant women be vaccinated.


What if I have already had COVID, do I still need the vaccine?

Yes, you should still receive the vaccine. Due to the severe health risks associated with COVID-19 and the fact that reinfection with COVID-19 is possible, you should still be vaccinated.


How soon after being infected from COVID should I get the vaccine?

 Current CDC guidelines state you can receive the vaccine as soon as you are fully recovered from symptoms and out of the quarantine period.  However, reinfection within 90 days of illness is uncommon, so it may be less critical to get the dose right away.  They can wait until closer to the end of the 90 days if they want.

If you were treated for COVID-19 symptoms with monoclonal antibodies or convalescent plasma, you should wait 90 days before getting a COVID-19 vaccine. 


The vaccines are not 100% effective, so why should I take them? 

The mRNA vaccines are nearly 100% effective against severe illness from COVID-19. Of the 32,000 people in the Pfizer trial, only one developed COVID-19 severe enough to require hospitalization. Beyond the 95% prevention of any clinical COVID-19 infection, the 5% that got the illness had a very minimal illness. So these vaccines are almost totally effective in preventing COVID-19 illness in all qualifying age groups.


If I can still spread the disease after I’ve received the vaccines, why should I take them? 

Disease spread was not a specific endpoint in the clinical trials, but if the clinical illness is reduced by 95%, the spread of the virus should also be reduced by 95%. In the Moderna trial, the asymptomatic disease appeared to be as reduced as significantly as symptomatic diseases.


Will the vaccines protect me against the new variants of Covid?

The current data suggest that the vaccines offer varying amounts of protection against the known mutant strains of Covid. While the protection may not reach 95%, it is still very significant.


There are (or will be) different Covid vaccines approved. Which one should I get?

The simplest answer is take whatever vaccine you can get as soon as you can get it since all of the approved (or likely to be approved) vaccines essentially eliminate the risk of a severe Covid infection that will lead to death.


Does the vaccine contain toxic chemicals that will make me sterile?

NO! There are no toxic chemicals in the vaccine. The lipid component is in many foods and cosmetics. The amount of this material you are exposed to every day is hundreds of times more than in the vaccine. All these substances have been shown to be safe in large studies because they are in food and cosmetics. Therefore, it is unlikely that anything in the vaccine would cause a toxic effect.

There are many false rumors about the Covid vaccines, specifically targeting women. Some of them are debunked here.


The information above was compiled from different sources, including:

Here are more links to frequently asked questions: 

Seasonal and Year-Round Allergies (Allergic Rhinoconjunctivitis)

Outdoor Allergens 

Seasonal allergic rhinitis, commonly referred to as hay fever, affects millions of people worldwide. Symptoms include sneezing, nasal congestion, runny nose, and itchiness in your nose, the roof of your mouth, throat, eyes, or ears. The most common seasonal triggers are pollen and mold spores in the air, which trigger a chain reaction in your immune system.

Your immune system controls how your body defends itself. For instance, if you have an allergy to pollen, the immune system identifies pollen as an invader or allergen. Your immune system overreacts by producing antibodies called Immunoglobulin E (IgE). These antibodies travel to cells that release chemicals, causing an allergic reaction.


Pollen consists of tiny grains needed to fertilize many kinds of plants. Pollen from plants with colorful flowers, like roses, usually do not cause allergies. These plants rely on insects to transport the pollen for fertilization. On the other hand, many plants have flowers that produce powdery pollen that is easily spread by wind. These culprits cause allergy symptoms.

Each plant has a period of pollination that does not vary much from year to year. Trees pollinate in the spring, grasses in the early summer, and weeds in the late summer/fall. In the St. Louis area, major trees causing symptoms in the spring are oak, ash, and mulberry. Ragweed is a major fall allergen, which typically causes symptoms around Labor Day. The weather can affect the amount of pollen in the air at any time. In warmer places, pollination can be year-round.


Molds are tiny fungi related to mushrooms but without stems, roots or leaves. Molds can be almost anywhere, including soil, plants, and rotting wood. Their spores float in the air, much like pollen. Outdoor mold spores begin to increase as temperatures rise in the spring. In the United States, mold spores reach their peak in July in warmer states and October in the colder states. They can be found year-round in the South and on the West Coast.

Pollen and Mold Levels

Pollen and mold count measures the number of allergens present in the air. The National Allergy Bureau is the nation’s only pollen and mold counting network certified by the American Academy of Allergy, Asthma & Immunology (AAAAI). The NAB compiles pollen and mold levels from certified stations across the nation. You can find these counts for different geographic areas here. Counts for St. Louis can be found at the St. Louis County Pollen and Mold Center.

Effects of Weather and Location

The severity of your symptoms may be affected by recent contact with other allergens, the amount of pollen exposure, and your sensitivity to pollen and mold. Hay fever symptoms are often less prominent on rainy, cloudy, or windless days because pollen does not move around during these conditions. Pollen tends to travel more with hot, dry, and windy weather, which can increase your allergy symptoms.


If your seasonal symptoms are making you miserable, we can help!

As board-certified allergists, we have the background and experience to determine which allergens, if any, are causing your symptoms. This information will form the basis of a personalized treatment plan to help alleviate your symptoms, including recommendations on how to avoid or minimize contact with your allergens where possible.

If your symptoms continue or if you have them for many months of the year, you may benefit from allergy immunotherapy (allergy shots). This treatment involves receiving regular injections given in gradually increasing doses. This helps your immune system become more resistant to the specific allergen and lessen your symptoms as well as the need for medications.

There are also simple steps you can take to limit your exposure to the pollen or molds that cause your symptoms:


  • Keep your windows closed at night and if possible, use air conditioning, which cleans, cools, and dries the air.
  • Try to stay indoors when the pollen or mold counts are high. If your symptoms are severe, wear a pollen mask if long periods of exposure are unavoidable. When you return indoors, take a shower, shampoo your hair and change clothes.
  • Avoid being responsible for mowing lawns or raking leaves. This stirs up pollen and molds. Also, avoid hanging sheets or clothes outside to dry.
  • When traveling by car, keep your windows closed.
  • Take any medications as prescribed.
  • Avoiding exposure during times of high pollen and mold counts will help ease symptoms.
  • The majority of hay fever medications work best if started before a pollen season begins. For spring allergies, we typically recommend starting medications around Valentine’s Day.
  • Allergy shots can often provide long-term relief of hay fever symptoms.



Indoor Allergens

Millions of people suffer year-round from allergy symptoms caused by indoor allergens. These culprits include dust mite droppings, animal dander, cockroach droppings, and molds.

When allergy symptoms occur year-round, the condition is called perennial allergic rhinitis. In addition to causing allergy symptoms, allergens can also trigger asthma flare-ups in people with allergic asthma.

Dust mites

Dust mite allergens are a common trigger of allergy and asthma symptoms. While they can be found throughout the house, these microscopic creatures thrive in warm, humid environments such as bedding, upholstered furniture, and carpeting.

Because so much time is spent in the bedroom, it is essential to reduce mite levels there. Encase mattresses, box springs, and pillows in special allergen-proof fabric covers or airtight, zippered plastic covers. Bedding should be washed weekly in hot water (130° F) and dried in a hot dryer. Allergen-proof covers are available for comforters and pillows that can’t be regularly washed.

Keep humidity low by using a dehumidifier or air conditioning. Wall-to-wall carpeting should be removed as much as possible. Instead, throw rugs may be used if they are regularly washed or dry cleaned.

Pet Allergens

There are no truly “hypoallergenic” breeds of dogs or cats. That is because people are not allergic to an animal’s hair, but to an allergen found in the saliva, dander (dead skin flakes), or urine of an animal with fur. While there are no cats and dogs that do not produce allergens, the amount of allergen exposure from pets may vary somewhat depending on the breed.

Pet allergy symptoms typically occur within minutes, with short-term exposure. With more chronic exposure symptoms may occur more chronically and not as acutely. For some people, symptoms build and become most severe 8 to 12 hours after contact with the animal. People with severe allergies can experience reactions in public places if dander has been transported on pet owner’s clothing.

If you have a pet that you are allergic to, try to minimize contact and keep the pet out of the bedroom and other rooms where you spend a great deal of time. As with dust mites, vacuum carpets often or replace carpet with a hardwood floor, tile, or linoleum. Keeping an animal outdoors is only a partial solution since homes with pets in the yard still have higher concentrations of animal allergens. If you have a cat allergy, there is a specific cat food that can decrease to some extent the amount of allergen produced by cats. You can read about that here Pro Plan LiveClear Allergen Reducing Cat Food.

While dander and saliva are the sources of cat and dog allergens, urine is the source of allergens from rabbits, hamsters, mice, and guinea pigs; so ask a non-allergic family member to clean the animal’s cage.

If you have a pet allergy, allergy immunotherapy (allergy shots) could be a great option! This strategy can often provide significant and long-term relief.


Cockroaches are often found in the homes of densely populated urban areas, schools, or commercial buildings, but these creatures can lurk almost anywhere. This does not mean that you have a dirty house or living area.

Block all areas where roaches can enter the home. This includes crevices, wall cracks, and windows. Cockroaches need water to survive, so fix and seal all leaky faucets and pipes. Have an exterminator go through the house when your family and pets are gone to eliminate any remaining roaches.

Keep food in lidded containers and put pet food dishes away after your pets are done eating. Vacuum and sweep the floor after meals, and take out garbage and recyclables. Use lidded garbage containers in the kitchen. Wash dishes immediately after use and clean under stoves, refrigerators, or toasters where crumbs can accumulate. Wipe off the stove and other kitchen surfaces and cupboards regularly.

Indoor Molds

Indoor molds and mildew need dampness typically found in basements, bathrooms, or anywhere with leaks. Get rid of mold growth on hard surfaces with water, detergent and, if necessary, 5% bleach (do not mix with other cleaners). Then dry the area completely. If mold covers an area of more than 10 square feet, consider hiring an indoor environmental professional. For clothing, washing with soap and water is best. If moldy items cannot be cleaned and dried, throw them away.

Repair and seal leaking roofs or pipes. Using dehumidifiers in damp basements may be helpful, but empty the water and clean units regularly to prevent mildew from forming. All rooms, especially basements, bathrooms, and kitchens, require ventilation and cleaning to deter mold and mildew growth. Avoid carpeting on concrete or damp floors, and storing items in damp areas.


Telemedicine Services Available!

Allergy, Asthma & Food Allergy Centers has been using the platform for telemedicine visits since Thursday, March 19, 2020, and this has been working very well for patients at all of our current locations (Swansea, Illinois; Bloomsdale/Ste. Genevieve, Missouri, and south county). Telemdicine appointments can also be done for those currently scheduled to be seen in our Chesterfield (west county) location at 16216 Baxter Rd. Suite 299, Chesterfield, MO 63017. As you know, we have moved most of our patients to telemedicine visits in the interest of public safety to decrease the spread of COVID-19 in our community while continuing to provide essential medical care.

If you are scheduled for any upcoming office visits, other than for biologic medication administration, our staff will continue to contact you before your appointment to convert your appointment to a telemedicine visit. The telemedicine visits enable new and established patients to keep their originally scheduled visits to discuss medical problems, treatment plans, allergy shots, and prescription medications while following the “stay at home” rules. These visits will be increasingly important for patients and families as the spring tree pollen season ramps up. The spring pollen season gets busy, and appointments can be scarce in the greater St. Louis area, but Allergy, Asthma & Food Allergy Centers has 8 active providers who are able to see patients via telemedicine even during these troubled times. Call 314-849-8700 or 618-233-8700 to schedule your telemedicine visit to help you stay healthy during this allergy season.

Telemedicine Frequently Asked Questions:

  1. How does telemedicine work?
    1. A staff member will call you in the morning on the day of your scheduled appointment to collect insurance information and copays.
    2. You will receive a text in most cases (an email if you cannot receive texts or prefer to do the visit using a computer/laptop/tablet) with a link from You can watch a brief instructional video here and/or review this document.
    3. Open the link through your phone or use Chrome browser when on a computer/laptop. You will need a strong internet connection and will need to give permission for the website to use your camera and microphone.
    4. Sign in with the patient’s first and last name and click the “Check In” box, which will place you in the virtual waiting room. You can also review the telemedicine consent and test your connection while in the waiting room.
    5. Once the visit has started, your provider will be able to see you, and you will be able to see them. Your provider may not always be looking at the camera, because they will have another screen open with your medical record so they can document and review your information. Please be assured that if the provider looks away, they are not being distracted from the visit, and your medical care is their sole focus during your appointment.
  2. Do I need to download any program or application?
    1. No, because the platform is web-based, you can access it from a browser on an internet connected device.
  3. What type of device do I need?
    1. You need an internet connected smartphone, tablet, computer, or laptop that has a camera and microphone. You will have to give the camera and microphone permission to access your web browser, which you should be able to do in the settings of your device, and we recommend you confirm this before your appointment.
  4. What else should I do to prepare for the visit?
    1. If you have a thermometer, please take your temperature before the visit to let the provider know so they can document it in your chart.
    2. Please take your pulse manually (instructions here) or with an apple watch, fitbit, or other device before the visit and let your provider know so they can document it in your chart.
    3. You can also review the telemedicine consent form here.
  5. Is the telemedicine visit secure?
    1. Yes, the telemedicine platform is secure and HIPAA compliant. 
  6. What if I do not receive a text or an email?
    1. If it is 5 minutes past your scheduled appointment and you have not received a text or email, please call our office.
  7. Is telemedicine more expensive than an office visit?
    1. No, you will have the same copay as you would with an in person office visit, but you do not have to leave the comfort of your home.
  8. I have read that insurance companies are waiving copays for telemedicine visits, so why do I have a copay?
    1. Insurance policies vary on this. If your insurance pays for the telemedicine visit, including the cost of the copay, you will receive a refund. You should be able to determine this by the explanation of benefits (EOB) that you will eventually receive from your insurance company.
  9. What if my primary allergist is not available for a telemedicine visit?
    1. Do not worry! Our fantastic advanced practice providers, Lauren Davis, PA-C, Laura Kahle, PA-C, or Dani Loftus, FNP-BC can see you if your primary allergist is not available.