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Immunology Lecture 4: Hypersensitivity Classification

10 Questions

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Immunology Lecture 4: Hypersensitivity Classification

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Questions and Answers

Which type of hypersensitivity is mediated through special cells?

Type II

Type IV (correct)

Type III

Type I

During which step of the mechanism of anaphylactic reaction does the immune system develop IgE and bind to mast cell?

Sensitization (correct)

Waiting period

Eliciting of anaphylactic reaction

None of the above

Which type of hypersensitivity involves the appearance of symptoms within minutes and disappearance after hours?

Type III

Type IV

Type II

Type I (correct)

Which type of hypersensitivity can be passively transferred by serum?

Type I Signup and view all the answers

What is the mode of entry classification for eliciting dose of the antigen in anaphylactic reactions?

Systemic and localized entry Signup and view all the answers

Which type of anaphylaxis occurs after the introduction of the allergen onto or into the skin?

Local anaphylaxis (Atopy) Signup and view all the answers

How is desensitization for the prevention of anaphylaxis achieved?

By frequent administration of small amounts of the antigen at weekly intervals Signup and view all the answers

Which type of reaction is characterized by injury of the cell after its reaction with the antibody, and involves complement fixation and cell damage?

Erythroblastosis foetalis Signup and view all the answers

What is the mechanism of cytotoxic (cytolytic) reactions Type II involving complement fixation and cell damage?

The "Ag-Ab" reaction is followed by complement fixation, through the classical pathway, leading to cell damage and lysis Signup and view all the answers

Which hypersensitivity type is cell mediated and involves sensitized T-lymphocytes, macrophages, and the release of certain cells responsible for this type of hypersensitivity?

Delayed hypersensitivity (Type IV) Signup and view all the answers