IMMUNOLOGY

Detailed explanation-1: -Allergies occur when your immune system reacts to a foreign substance-such as pollen, bee venom or pet dander-or a food that doesn’t cause a reaction in most people. Your immune system produces substances known as antibodies.

Detailed explanation-2: -When you have a pet allergy, you are not allergic to the pet’s hair, fur, or feathers. You are allergic to the protein that is found in the pet’s dander (dead skin cells) saliva, and urine. The hair, fur, or feathers collect the dander. It can also carry other allergens like dust mites, mold, and pollen.

Detailed explanation-3: -An allergen is a substance that can cause an allergic reaction. After being exposed to a substance such as bee sting venom, the person’s immune system becomes sensitized to it.

Detailed explanation-4: -Food allergies occur when the body’s immune system reacts to certain proteins in food. Food allergic reactions vary in severity from mild symptoms involving hives and lip swelling to severe, life-threatening symptoms, often called anaphylaxis, that may involve fatal respiratory problems and shock.

Detailed explanation-5: -Allergies occur when immunoglobulin E (IgE), part of the body’s immune system, binds to food molecules. A protein in the food is usually the problem. This triggers the release of inflammatory chemicals such as histamine.