This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Frozsen DPT vaccine should be - 
Select and explain. 
A. Shaken thoroughly before use, B. Allowed to melt before use, C. Discarded, D. Brought to room temperature before use
C: Discarded
Answer: C: Discarded 
Explanation: .DPT/DT vaccines should not be frozen.they should be stored in a refrigerator between 2 to 8 deg.C.vaccine should be used before the date of expiry.the vaccine will lose its potency if kept at room temperature for a long period of time. ref:park&;s textbook,ed 22,pg no 153