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A 31-year-old member asked:

can you tell me about immunology - hypersensitivity reactions?

1 doctor answer1 doctor weighed in
Dr. Michael Rupp
Allergy and Immunology 21 years experience
AKA Allergies: Immunologic hypersenstivity reactions are any reaction that occurs due to an overreaction or inappropriate reaction by your immune system. The most common example is allergies. Other examples include contact dermatitis, chronic hives, large local reactions to insect bites. There are some types of hypersensitivty that do not involve allergy type reactions, but they are rare.

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A member asked:

Will my son's strange reaction following antibiotics last.

4 doctor answers11 doctors weighed in
Dr. Irwin Berkowitz
Specializes in Pediatrics
Yes: Allergic reactions to antibiotics, ie hives can last up to two weeks after stopping the medication. Antibiotic induced diarrhea can improve soon after discontinuing the antibiotics or linger. There are other nonspecific rashes that are not an allergy but an interaction between the antibiotic and a virus that can last for days. Behavioral reactions to colorings or flavors abate qickly.
A 21-year-old member asked:

Some of my patients describe having had a severe reaction to something they were given for tetanus many years ago. What could this be?

2 doctor answers3 doctors weighed in
Dr. James Ferguson
Pediatrics 46 years experience
If a child;pertussis: The formulation given to kids as DTP up to 1992 contained the whole cell preparaation for pertussis. This was an effective but problamatic vaccine, as 30% had fever by the 2nd dose and older kids were very sore. It wasn't given over 6y due to its many side effects. The acellular pertussis vaccine replaced it that year & has been remarkable in its lack of shot reactions.
A 24-year-old member asked:

How can I reduce the risk of allergic reactions?

2 doctor answers9 doctors weighed in
Dr. Maziar Rezvani
Allergy and Immunology 21 years experience
Allergic Reactions: Theoretically, the only way that you can decrease the risk of allergic reactions is to try and avoid the allergen which you are allergic to. If that is not sufficient and you do not want to take allergy medicines, you may want to consider desensitization/immunotherapy or "allergy shots". This is in regards to immediate hypersensitivity reactions and not delayed reactions to allergens.
A 33-year-old member asked:

What are the dangers of allergic reactions? My new housemate has a bunch.

1 doctor answer1 doctor weighed in
Dr. Jeffrey Rosch
Allergy and Immunology 49 years experience
Allergy symptom vary: Allergic reactions can vary from minimally annoying to fatal. If your housemate has more than mild nasal, eye, or skin symptoms i would suggest seeing a board certified allergist to define and appropriately treat the allergies.
A 39-year-old member asked:

How long do mosquito bite reactions happen?

1 doctor answer3 doctors weighed in
Dr. Michael Ekizian
A Verified Doctoranswered
A US doctor answeredLearn more
Duration?: Local pain, itching, and redness of the skin are typical after a mosquito bite. There is usually an immediate wheal and flare response that peaks at about 20 minutes, or a hard, itchy, bump that peaks at two to three days and resolves over the ensuing days to weeks.
Dr. Harold Peltan
Ophthalmology 28 years experience
Agree. And don't scratch it. It will take longer to resolve.
Sep 8, 2013

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Last updated Sep 28, 2016

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