Question

QUESTION 29 Why are type IV hypersensitivities called delayed hypersensitivity reactions? Type IV reactions only occur in underdeveloped countries and medical attention often needs to be delayed until the patient can be brought to a hospital. Type IV reactions affect nerve cells and cause nerve impulses to slow resulting in visibly slower movements from the patient Drugs to counteract type IV reactions are large and slow to be absorbed by the affected cells causing the patient to tolerate a lengthy symptomatic phase before recovery is complete. Type IV reactions manifest slowly over 12-72 hours after the stimulating antigen is encountered Although type IV reactions can cause skin lesions, watery eyes, and a runny nose, treatment for those symptoms needs to be delayed due to the rapid drop in blood pressure which soon follows and needs to be dealt with first

Answer 1

Answer ; Type IV reaction manifest slowly over !2 - 72 hours after the stimulating antigen is encountered.

Rationale; The reason that the response is delayed due to the fact of antigen, But not by antibody response, as seen in some other kind of hypersensitivity, which is more rapid in response. The other option given in the questions are not logical to the Hypersensitivity reaction.