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Questions and Answers
Which type of hypersensitivity reaction is distinct from type II hypersensitivity?
Which type of hypersensitivity reaction is distinct from type II hypersensitivity?
- Type V
- Type III
- Type IV
- Type I (correct)
How can exposure to allergen occur in type II hypersensitivity?
How can exposure to allergen occur in type II hypersensitivity?
- Direct contact
- Ingestion
- Inhalation
- Injection (correct)
In which type of hypersensitivity reaction can allergen exposure happen through inhalation?
In which type of hypersensitivity reaction can allergen exposure happen through inhalation?
- Type IV
- Type I (correct)
- Type II
- Type III
Which type of hypersensitivity shares similar characteristics with type II hypersensitivity?
Which type of hypersensitivity shares similar characteristics with type II hypersensitivity?
Which type of hypersensitivity has no direct relation to type II hypersensitivity?
Which type of hypersensitivity has no direct relation to type II hypersensitivity?
Which type of hypersensitivity reaction involves antibody-mediated cellular dysfunction?
Which type of hypersensitivity reaction involves antibody-mediated cellular dysfunction?
In which type of hypersensitivity reaction are antigens usually intrinsic components of cells or tissues?
In which type of hypersensitivity reaction are antigens usually intrinsic components of cells or tissues?
Which mechanism characterizes Type II hypersensitivity reactions?
Which mechanism characterizes Type II hypersensitivity reactions?
What is the time frame for the onset of Type II hypersensitivity reactions?
What is the time frame for the onset of Type II hypersensitivity reactions?
Which type of hypersensitivity reaction involves immune complexes depositing in tissues?
Which type of hypersensitivity reaction involves immune complexes depositing in tissues?
When does the tuberculin (Montoux) reaction peak after the injection of antigen?
When does the tuberculin (Montoux) reaction peak after the injection of antigen?
What is the classical example of hypersensitivity discussed in the text?
What is the classical example of hypersensitivity discussed in the text?
In which type of hypersensitivity reaction does the tuberculin (Montoux) reaction fall?
In which type of hypersensitivity reaction does the tuberculin (Montoux) reaction fall?
What antigen is used in the tuberculin (Montoux) reaction?
What antigen is used in the tuberculin (Montoux) reaction?
At what time point does the tuberculin (Montoux) reaction reach its peak according to the text?
At what time point does the tuberculin (Montoux) reaction reach its peak according to the text?
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Study Notes
Hypersensitivity Reactions
- There are four types of hypersensitivity reactions: type I, type II, type III, and type IV, distinguished by their mechanisms and time frames.
- Exposure to allergens can occur through ingestion, inhalation, injection, or direct contact.
Classification of Hypersensitivity Reactions
- Type I, type II, type III, and type IV hypersensitivities have distinct mechanisms and time frames.
Type IV Hypersensitivity
- A classical example is the tuberculin (Montoux) reaction, which peaks 48 hours after antigen injection (old tuberculin).
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