An allergic reaction typically occurs once the immune system of the body generates antibodies known as IgE on a particular allergen. In the future, when the individual encounters the allergen, the IgE will trigger the white blood cells to release histamine which quickly initiates the symptoms of an allergic response such as edema, rashes, itchiness and wheezing.
In some cases, an allergic reaction does not manifest for hours or even days. This is known as a delayed reaction allergy which is triggered by the contact amidst the allergen and T cells. There are various allergens that causes delayed allergic reactions. It is important that you know how to handle the symptoms of an allergic reaction. Proper training is a must if a family member has an allergy. With this in mind, you can take a courseon first aid training today.
Drug reactions
The reactions to drugs can occur right away or as a delayed allergic reaction. It is important to note that penicillin as well as other similar antibiotics is the prevailing cause of allergic reactions and can occur as delayed reaction in some individuals.
In most cases, an allergic reaction can cause serum sickness which includes weakness, fever, hives, swelling of the lymph nodes and joint pain. Even though antibiotics are often linked with delayed allergic reactions, any drug including anesthetics, anticonvulsants, heart medications and even preservatives can trigger a delayed allergic reaction. Swelling, itchiness and rashes particularly on the face often occur during this type of reaction.
Contact reactions
Take note that poison ivy and other related plants can trigger a delayed allergic reaction in some individuals. Once an individual initially gets in contact with the plant, there is no reaction for the first 24-48 hours. The moment the itchiness, blisters and rash manifest, an allergic reaction to poison ivy can span up to 8 weeks to fully resolve. The other prevalent sources of delayed allergic reactions include exposure to metals such as cobalt and nickel, formaldehyde, neomycin and potassium dichromate. Even latex allergy is becoming common among medical professionals which can also trigger a delayed allergic reaction.
Reactions to food
Reactions to certain foods can also cause delayed allergic reactions which manifest eight hours or more after consumption. It is important to note that food allergies affect both children and adults. The common foods that trigger an allergic response include mollusks, legumes, eggs, milk, crustaceans, fish, tree nuts and wheat. The symptoms during a delayed allergic reaction include rashes, nausea, vomiting and asthma-like symptoms. Additionally, food additives such as monosodium glutamate, sulfites, aspartame and food coloring can also cause a delayed allergic reaction.
It is important for the individual to undergo proper testing either a skin prick test or blood test. Both tests are used to determine the exact allergen that triggers an allergic response.