The efficiency of cold chain system for oral polio vaccine as monitored by Vaccine Vial Monitor (VVM) depends on:
Vaccine Vial Monitor (VVM) - Heat sensitive label that indicates cumulative heat exposure over time. - Whether the OPV l can be used or not depends upon the irreversible colour changes in vaccine l monitor. - If color of inside square lighter than outside circle - We can use the vaccine
Storage of vaccines
Change in the colour of vaccine
Temperature indicator of the system
Viral potency test
Change in colour of monitor
Change in colour of monitor