<prompt> Frozsen DPT vaccine should be -Shaken thoroughly before useAllowed to melt before useDiscardedBrought to room temperature before use  <response>: .DPTDT 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 