Reverse cold chain is used for

A. Carrying stool samples of polio patients from a PHC to the lab

B. Transpoing outdated vaccines from PHC to district hospital

C. Transpoing vaccine to lab, to check its potency

D. Transpoing vaccine from camps to sub - centre

Correct Answer: Carrying stool samples of polio patients from a PHC to the lab

Description: The cold chain is a system of storage and transpo of vaccines at low temperatures from the manufacturer to the actual vaccination site. The cold chain system is necessary because vaccine failure may occur due to failure to store and transpo under strict temperature control (refer pgno:109 park 23 rd edition)

Category: Social & Preventive Medicine

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