15 Questions
Which type of hypersensitivity reaction is distinct from type II hypersensitivity?
Type I
How can exposure to allergen occur in type II hypersensitivity?
Injection
In which type of hypersensitivity reaction can allergen exposure happen through inhalation?
Type I
Which type of hypersensitivity shares similar characteristics with type II hypersensitivity?
Type III
Which type of hypersensitivity has no direct relation to type II hypersensitivity?
Type IV
Which type of hypersensitivity reaction involves antibody-mediated cellular dysfunction?
Type II
In which type of hypersensitivity reaction are antigens usually intrinsic components of cells or tissues?
Type II
Which mechanism characterizes Type II hypersensitivity reactions?
Antibody-mediated cellular dysfunction or destruction
What is the time frame for the onset of Type II hypersensitivity reactions?
Minutes to hours
Which type of hypersensitivity reaction involves immune complexes depositing in tissues?
Type III
When does the tuberculin (Montoux) reaction peak after the injection of antigen?
48 hours
What is the classical example of hypersensitivity discussed in the text?
Tuberculin (Montoux) reaction
In which type of hypersensitivity reaction does the tuberculin (Montoux) reaction fall?
Type IV
What antigen is used in the tuberculin (Montoux) reaction?
Old tuberculin
At what time point does the tuberculin (Montoux) reaction reach its peak according to the text?
48 hours
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).
Test your knowledge on the different types of hypersensitivities, with a focus on type I and its distinctions from type II, type III, and type IV. Learn about various ways of allergen exposure such as ingestion, inhalation, injection, or direct contact.
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