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  2. Type III hypersensitivity - Wikipedia

    en.wikipedia.org/wiki/Type_III_hypersensitivity

    Type III hypersensitivity, in the Gell and Coombs classification of allergic reactions, occurs when there is accumulation of immune complexes (antigen-antibody complexes) that have not been adequately cleared by innate immune cells, giving rise to an inflammatory response and attraction of leukocytes.

  3. Allergic contact dermatitis - Wikipedia

    en.wikipedia.org/wiki/Allergic_contact_dermatitis

    By its allergic nature, this form of contact dermatitis is a hypersensitive reaction that is atypical within the population. The mechanisms by which these reactions occur are complex, with many levels of fine control. Their immunology centres on the interaction of immunoregulatory cytokines and discrete subpopulations of T lymphocytes.

  4. Type IV hypersensitivity - Wikipedia

    en.wikipedia.org/wiki/Type_IV_hypersensitivity

    Type IV hypersensitivity, in the Gell and Coombs classification of allergic reactions, often called delayed-type hypersensitivity, is a type of hypersensitivity reaction that can take a day or more to develop. [1] Unlike the other types, it is not humoral (not antibody-mediated) but rather is a type of cell-mediated response.

  5. Hypersensitivity - Wikipedia

    en.wikipedia.org/wiki/Hypersensitivity

    The first three types are considered immediate hypersensitivity reactions because they occur within 24 hours. The fourth type is considered a delayed hypersensitivity reaction because it usually occurs more than 12 hours after exposure to the allergen, with a maximal reaction time between 48 and 72 hours. [9]

  6. Serum sickness - Wikipedia

    en.wikipedia.org/wiki/Serum_sickness

    Serum sickness is a type III hypersensitivity reaction, caused by immune complexes. [2] When an antiserum is given, the human immune system can mistake the proteins present for harmful antigens . The body produces antibodies, which combine with these proteins to form immune complexes. [ 2 ]

  7. Urushiol-induced contact dermatitis - Wikipedia

    en.wikipedia.org/wiki/Urushiol-induced_contact...

    For people who have never been exposed or are not yet allergic to urushiol, it may take 10 to 21 days for a reaction to occur the first time. Once allergic to urushiol, however, most people break out 48 to 72 hours after contact with the oil. Typically, individuals have been exposed at least once, if not several times, before they develop a ...

  8. Drug rash with eosinophilia and systemic symptoms - Wikipedia

    en.wikipedia.org/wiki/Drug_rash_with_eosinophil...

    The symptoms of DRESS syndrome usually begin 2 to 6 weeks but uncommonly up to 8–16 weeks after exposure to an offending drug. Symptoms generally include fever, an often itchy rash which may be morbilliform or consist mainly of macules or plaques, facial edema (i.e. swelling, which is a hallmark of the disease), enlarged and sometimes painful lymph nodes, and other symptoms due to ...

  9. Drug allergy - Wikipedia

    en.wikipedia.org/wiki/Drug_allergy

    A drug allergy is an allergy to a drug, most commonly a medication, and is a form of adverse drug reaction. Medical attention should be sought immediately if an allergic reaction is suspected. An allergic reaction will not occur on the first exposure to a substance.