VVM is the heart of a vaccine. With its color change, VVM signals to the health worker that vaccine is alive. Like a heart, it beats all the time.
VVM tells if a vaccine has been exposed to excessive temperature and might have been, therefore, damaged. VVM indicates if a vaccine can be used or not. The color change, like the heartbeat, keeps ensuring health workers that vaccines work.
Негізгі бет Vaccines work
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