Social & Preventive Medicine Reverse Cold Chain is used for – A Carrying stool samples of polio patiens from a PHC to the lab B Transpoing outdated vaccines from PHC to district hospital C Transpoing vaccines to lab. to check its potency D Transpoing vaccine form camps to sub - centre 💡 Explanation Reverse Cold Chain is used for - ✓ Correct Answer: A. Carrying stool samples of polio patiens from a PHC to the lab