Frozsen DPT vaccine should be -
.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
Shaken thoroughly before use
Allowed to melt before use
Discarded
Brought to room temperature before use
Epidemiology