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Click on icon to see table/diagram/imageVaccine Vial Monitors (VVMs) are on the cap (2 ml vial)/part of the label on Inactivated Poliomyelitis Vaccine (Types 1, 2 and 3) [Poliovac] supplied through Serum Institute of India Pvt. Ltd. This is a time-temperature sensitive dot that provides an indication of the cumulative heat to which the vial has been exposed. It warns the end user when exposure to heat is likely to have degraded the vaccine beyond an acceptable level.
The interpretation of the VVM is simple. Focus on the central square. Its colour will change progressively. As long as the colour of this square is lighter than the colour of the outer circle, then the vaccine can be used. As soon as the colour of the central square is the same colour as the outer circle or of a darker colour than the outer circle, then the vial should be discarded.
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