The allergic reaction occurs once the immune system generates antibodies against a particular allergen present in the body. Once the individual encounters the allergen in the future, the immunoglobulin E antibodies instructs the white blood cells to produce histamine which is responsible for triggering the symptoms of an allergic reaction such as wheezing, rashes and edema among highly sensitive individuals.
In some circumstances, an allergic reaction will not manifest for hours or even days. This is called as a delayed-reaction allergy that is triggered by the interaction between the allergen and T cells which is also a type of white blood cell. Various substances can instigate delayed-reaction allergies.
By enrolling in a course on first aid today, you can learn how to properly manage the symptoms that will manifest during a delayed-reaction allergy. With the proper steps, you can help ease the symptoms experienced by the individual.
What are contact reactions?
Poison ivy and other similar plants can trigger some of the usual delayed-reaction allergies. Once an individual is directly exposed to the plant, there are no reactions for the initial 24-48 hours. The moment the itchiness, blisters and rashes manifest, an allergic response to poison ivy can take up to 8 weeks to resolve.
The other usual sources of delayed-reaction allergies include exposure to certain metals such as cobalt or nickel, neomycin which is an antibiotic present in topical creams, potassium dichromate, formaldehyde and tanning agents used in clothing and leather shoes. Latex allergy which is quite common among healthcare professionals can also cause a delayed-reaction allergy.
The food reactions are also common causes of delayed-reaction allergies which occur 8 hours or more after ingestion. The most common allergenic foods include mollusks, legumes, fish, eggs, wheat, crustaceans and tree nuts. Rashes, nausea, vomiting and asthma-like symptoms can occur as delayed sensitivity reactions. Even some food additives such as monosodium glutamate, sulfites, FD&C yellow 5 and aspartame can lead to delayed-reaction allergies.
The drug reactions can manifest right away or as a delayed-reaction allergy. Penicillin and other similar antibiotics are the most common cause of allergic reactions and can manifest as delayed-reaction allergies.
Some of the allergic reactions can trigger serum sickness which includes weakness, fever, joint pain, hives and swelling of the lymph nodes. Even though antibiotics are most often linked with delayed-reaction allergies, any drug such as anesthetics, anticonvulsants, heart medications and even preservatives can trigger delayed-reaction allergies. Symptoms such as swelling, rashes and itchiness especially on the face often occur during delayed reactions.
If you suspect that an individual is prone to suffer from delayed-reaction allergies, it is best to consult a doctor for proper testing in order to determine the offending allergen. Once determined, the individual must make it a point to avoid exposure to prevent a reaction from occurring.