EraPolio Caution For Usage

The Vaccine Vial Monitor: Vaccine Vial Monitors (VVMs) are part of the label on Poliomyelitis Vaccine (Vero Cell), Inactivated, Sabin Strains supplied through Sinovac Biotech Co., Ltd. The color dot which appears on the label of the vial is a VVM. This is a real-time temperature sensor 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 by observation of the color change progressively in the central square. As long as the color of this square is lighter than the color of the ring, the vaccine can be used. As soon as the color of the central square is the same color as the ring or of a darker color than the ring, the vial should be discarded. VVM7 is used for Poliomyelitis Vaccine (Vero Cell), Inactivated, Sabin Strains and it may reach the endpoint for use before the vaccine reaches the end of the shelf life.
Vaccine Vial Monitors: USE: Square is lighter than outer circle.
The color of the inner square of the VVMs begins with a shade that is lighter than the outer circle and continues to darken with time and/or exposure to heat.
DO NOT USE: Square matches circle.
Square is darker than circle.
Once a vaccine has reached or exceeded the discard point, the colour of the inner square will be the same colour or darker than the outer circle.
Inform the supervisor.
Cumulative heat exposure over time.