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4387 Social & Preventive Medicine

Vaccine Vial Monitors (VVM) have been extensively used in the Pulse Polio Programme to assess the effectiveness of cold chain. According to the guidelines, the following changes in the VVM is an indication for discarding the vaccines –

AInner square is lighter than outer circle
BOuter square is higher than inner circle
CInner circle is same colour as that of outer circle
DInner square is darker than outer circle (Correct Answer)