Chronic urticaria is a -
Ans. is 'a' i.e., Type 1 hypersensitivity reaction Types of hypersensitivity reactionType of hypersensitivity reactionExamplesMediatorsType 1 (immediate type)Atopic dermatitisUrticariaAnaphylaxisInsect bite hypersensitivityAllergic rhinitis and asthmaIgEType 2 (cytotoxic, antibody dependent)Autoimmune hemolytic anemiaRheumatic heart diseaseThrombocytopeniaErythroblastosis foetalisGoodpasture's syndromeGrave's diseaseMyasthenia gravisIgG or IgMMACComplementType 3 (immune complex disease)Serum sicknessArthus reactionRheumatoid arthritisPost streptococcal glomerulonephritisMembranous nephropathyLupus nephritisSystemic lupus erythematosusExtrinsic allergic alveolitis(hypersensitivity pneumonitis)Generalized drug eruptionErythema multiformeErythema nodosumTENIgGComplementNeutrophillsType 4 (delayed type)TuberculosisLeprosyContact dermatitisChronic transplant rejectionMultiple sclerosisT-cells
Type 1 hypersensitivity reaction
Type 2 hypersensitivity reaction
Type 3 hypersensitivity reaction
Type 4 hypersensitivity reaction
Dermatitis Erythema