Question

Tell me some important thing about VVM

Answer 1

heya


vaccine vial monitor:


VVM is a small label stuck on the vial of a vaccine which changes color as the vaccine vial is exposed to heat.
The color of the VVM central square indicates if the vaccine is safe for use or not. It is a small light purple circle with a white square in the center. The square remains white if there is no exposure to heat. With heat exposure the square begins to darken. It registers the cumulative heat exposure over time.
The combined effects of time and temperature cause the inner square of the VVM to darken, gradually and irreversibly.
Till the time for which the center square is lighter than the surrounding circle the vaccine is safe for use.
As soon as the square becomes the same color as the background or is darker, the heat may have damaged the vaccine and the vial should be discarded.