WORLD IMMUNIZATION WEEK
VACCINES WORK
VVM is one of the greatest inventions in public health. It is the only tool among all time-temperature indicators that is available at any time in the process of distribution and at the time a vaccine is administered. VVM indicates whether the vaccine has been exposed to a combination of excessive temperature over time and whether it is likely to have been damaged.
https://www.slideshare.net/Umit/vaccines-work
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