Medical MCQ-The efficiency of cold chain system for oral polio vaccine as monitored by Vaccine Vial Monitor (VVM) depends on

Change in colour of monitor

Temperature indicator of the system

Viral potency test

Change in the colour of vaccine

Question Category:

Correct Answer:

Change in colour of monitor

Description:

WHO grading of VVM in OPV: (Marker of pofency) Is based on colour changes in VVM: ONLY INNER SQUARE CHANGES COLOUR, circle always remain blue.

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