Social & Preventive Medicine All of the following statements are true about DPT vaccine except. A It should be stored in deep freezer. B Exposure to direct sunlight, when in use should be avoided. C Store stocks are needed for three months at PHC level. D Half-used vials should not be put back into the cold chain after the session. 💡 Explanation All of the following statements are true about DPT vaccine except. ✓ Correct Answer: A. It should be stored in deep freezer.