BE Td Caution For Usage

Presentation available with or without vaccine vial monitor (VVM): USE: Square is lighter than outer circle.
The color of the inner square of the VVM starts 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 outer circle.
Square is darker than outer 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.
VVM is a label containing a heat-sensitive material which is placed on a vaccine vial to register cumulative heat exposure over time. The colour dot appears on the VVM label in square element 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 ring, then the vaccine can be used. As soon as the colour of the central square is the same colour as the ring or of a darker colour than the ring, then the vial should be discarded.
For the use of a Registered Medical Practitioner or a Hospital or a Laboratory only.