Not true about vaccines ?

Ans. is 'c' i.e., In vaccine l monitor if the color of inner square is same as outer background, vaccine is good for use Vaccine Vial monitor An impoant improvement in PPI during 1998 has been the use of vaccine l monitor. Colour monitors or labels are put on vaccine bottles. Each label has a circle of deep blue colour. Inside it is a white square which changes colour and gradually becomes blue, if vaccine bottle is exposed to higher temprature. When the colour of the white square becomes blue like that of surrounding circle, the vaccine should be considered ineffective. Thereby, the health worker can easily asceain that the vaccine being given is effective or not.