The<unk>  consists of a heat sensitive square within a circle. If the<unk>  is exposed to heat it changes color with time and with increasing speed in hotter conditions. If the square becomes the same color as the circle or becomes darker than the circle, then the vaccine contained in the<unk>  is damaged and the<unk>  should be discarded. Studies have shown that health workers without proper training sometimes do not understand what a VVM is or how it works. A 2007 study in urban areas of Valsad in India showed that vaccine administrators were unaware of the purpose of the<unk> s.
Vaccine vial monitor
Isolation tank
Safety syringe
EMRTS Cymru
Virus counter
FluTrackers
Death panel
Vaccine cooler