Polio drops in pakistan | Oral polio vaccines (OPV) used in Pakistan are prequalified.

All of the oral polio vaccines (OPV) used in Pakistan are prequalified by the World Health Organization, which guarantees they are safe, potent and of high quality.
OPV is sensitive to high temperatures and loses potency if exposed to heat for prolonged periods of time. A stringent system of refrigeration, cold boxes and vaccine carries, called the “cold chain system,” is put in place to ensure that OPV remains within a recommended temperature range through its entire journey until it is administered.
Vials of OPV are equipped with heat sensitive indicator labels on each OPV vial, which is called the vaccine vial monitor (VVM). The VVM allows health workers to know if the polio vaccine has been exposed to heat. Workers administer drops only with vails having valid VVM and expiry dates.
The Pakistan Polio Programme has a WHO-certified and -approved laboratory in Islamabad which authenticates that all the ingredients and quality of the polio vaccine are safe for human consumption.