oac allegy and asthma specialists

 Providing over 30 Years of Quality Allergy Care

Lawrence Hennessey, M.D.

Manoj Mohan, D.O.

Kamal Mohan, M.D. (Founder, Retired)

Andrea Miller, N.P.

New Patient







Our walk-in injection hours are:

Monday through Friday 8:30AM to 10:30AM and 12:45PM to 5:00PM


Okemos Allergy Center News:


 THANK YOU Dr. Hennessey for all you do!  You will be missed!


Just a reminder, we will be closed for the holidays on the following dates:

November 25th, November 26th, December 23rd, December 24th and December 31st

 We look forward to seeing you yet this year and into 2022!



We are requiring masks for all patients and staff.

Please bring and wear your mask when entering our building as we do not have enough to hand out.


 A message from Dr. Hennessey on behalf of Okemos Allergy Center and Okemos Infusion Center regarding the COVID-19 Vaccine:


We strongly encourage our patients to receive the COVID-19 Vaccine, but many have concerns about whether or not they should get it due to a history of allergies, asthma, or immune issues.

So far, over 235 million Americans have received at least the first dose of the vaccine, and the risk of allergic reactions from either of the three vaccines currently in use is about 1.3 reactions per 100,000 doses.  The majority of the reactions have not been severe, with no fatalities reported.

We do not recommend a particular vaccine, as the Pfizer, Moderna and Johnson & Johnson products appear to be safe and effective.  Unfortunately, we do not foresee administering vaccines in our office.

Asthma and nasal allergies DO NOT appear to increase the risk of an allergic reaction to the vaccine.

Although people with a previous history of severe allergic reactions (anaphylaxis) appear to be at increased risk for a COVID-19 Vaccine reaction, the risk is still very low, and the locations where the vaccine is administered should have the ability to treat a reaction should one occur.  If you have epinephrine for self-injection, e.g., Epi-Pen or Auvi-Q, it’s reasonable to have it with you when you receive the vaccine, and you may wish to wait for 30 minutes following your shot rather that the standard 15-minute recommended wait.

Although the vaccine may be less effective for some patient with immune deficiency, it does not pose a greater risk of side effects for these individuals, and is still recommended.

Mild reactions, including pain at the injections site, fever, aches, and fatigue can occur.  These reactions are not serious, and are similar to those seen with other immunizations, e.g., the shingles vaccine.

People allergic to other vaccines should still be able to receive the COVID-19 Vaccine, since it does not appear to cross-react with other immunizations.

The only reason not to receive the vaccine is a history of a severe reaction to the first dose, or a history of allergy to one of the components of the vaccine.  The rare allergic reactions appear to be due to the stabilizers in the vaccine, especially polyethylene glycol (PEG) and polysorbate-80.  These are common chemicals found in a large number of consumer products and are generally safe.  PEG, for example, is the main ingredient in the laxative MiraLAX.   We have both of these substances available for skin testing for patient who feel that they may be allergic to one of these chemicals.

Finally, for those still reluctant to receive the immunization, it’s important to put things in perspective:  The risk of dying from COVID-19 is about 1%, with a much higher mortality rate for older individuals or those with immune issues, diabetes, or heart disease, and so far over 1 in 1,000 Americans have died of COVID-19.  As more people get immunized, the sooner we’ll reach the level of “Community Immunity” needed to halt this pandemic!

Please feel free to contact us if you have any further questions.



Allergy & Asthma Specialists

Our physicians and experienced staff provide comprehensive and personalized allergy and immunological care for both adult and pediatric patients suffering from nasal allergies, food allergies, asthma, eczema, urticaria, stinging insect allergies, latex allergies and drug allergies. Information contained on our website is not intended to diagnosis or treat your symptoms. Always consult a physician for proper treatment.

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