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Hypersensitivity reactions are classified into four categories: Type I (immediate hypersensitivity), which involves IgE-mediated responses leading to allergic reactions; Type II (antibody-mediated cytotoxicity), where antibodies target specific cells; Type III (immune complex-mediated), characterized by the formation of antibody-antigen complexes that trigger inflammation; and Type IV (delayed-type hypersensitivity), which is mediated by T cells and manifests hours to days after exposure to the allergen. Each type involves distinct immune mechanisms and clinical manifestations.
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Which type of hypersensitivity reaction causes an asthma attack?
Type I hypersensitivity reaction http://en.wikipedia.org/wiki/Asthma
What occurs when the immune system mounts an exaggerated response to a harmless antigen?
hypersensitivity
Hay fever is a type of reaction?
Hypersensitivity
What is the same as hypersensitivity?
Hypersensitivity is also known as allergic reaction, exaggerated immune response, or allergic sensitivity.
What hypersensitivity reaction does not involve an antibody response?
Type IV
What is an Arthus reaction?
An Arthus reaction is a hypersensitivity reaction involving the in situ formation of antigen/antibody complexes after the intradermal injection of an antigen.
Is a transfusion reaction a subacute hypersensitivity to foreign red blood cells?
A transfusion reaction is typically an acute hypersensitivity reaction to foreign red blood cells, which can occur immediately or within a few hours of the transfusion. Subacute hypersensitivity reactions usually take days to develop after exposure to the antigen, unlike the immediate onset of symptoms seen in transfusion reactions.
What individual hypersensitivity to a substance usually antibody-antigen reaction is known as?
It is an allergy
What does hay fever and hives have in common?
they are all hypersensitivity reaction
What has the author Mariana C Castells written?
Mariana C. Castells has written: 'Anaphylaxis and hypersensitivity reactions' -- subject(s): Hypersensitivity, Anaphylaxis, Acute phase reaction, Clinical immunology, Allergy, Acute-Phase Reaction
What is dermal hypersensitivity reaction?
Dermal hypersensitivity reaction is an exaggerated immune response in the skin to certain substances or allergens. This reaction can lead to symptoms such as redness, itching, swelling, and rash at the site of contact with the allergen. Common causes include contact dermatitis, eczema, or allergic reactions to chemicals, plants, or certain metals.
What is the name of the hypersensitivity reaction that occurs after a person who is allergic to bee stings is stung by a bee?
Anaphylactic shock
