Question

When in skin allograft, second set of rejection occurs?

• A. 10-14 days
• B. 5-7 days
• C. After a month
• D. After a week

Hint:

In skin allografts, second-set rejection occurs faster due to prior sensitization of the immune system.

Answer 1

The Correct Option is B

Step 1: Understanding Graft Rejection 
The first set of graft rejection occurs after 10-14 days due to the primary immune response. In a second set of rejection, the immune response is faster due to memory immune cells. 
Step 2: Evaluating the Options 
- 10-14 days: First set of rejection, not the second. 
- 5-7 days: Correct, second set of rejection occurs faster, typically within 5-7 days. 
- After a month: Too late for second-set rejection. 
- After a week: Not the typical time frame for second-set rejection. 
Step 3: Conclusion 
The second set of rejection typically occurs within 5-7 days.