Question

VVM (Vaccine Vial Monitor) is used to monitor effectiveness of the cold chain. Which of the following is an indication NOT to discard the vaccine?
(A) Inner square is white.
(B) Inner square is lighter than outer circle.
(C) Inner square is darker than the outer circle.
(D) Outer circle is more dark than inner square.

• A. (A), (B) and (D) only.
• B. (A), (B) and (C) only.
• C. (A), (B), (C) and (D).
• D. (B), (C) and (D) only.

Hint:

Always check the VVM for color contrast before using a vaccine. If the inner square is darker than the outer circle, discard the vial.

Answer 1

The Correct Option is A

The Vaccine Vial Monitor (VVM) is a label containing a heat-sensitive material that helps determine if a vaccine has been exposed to conditions that render it ineffective. The vaccine is safe to use under the following conditions:

• The inner square remains white.
• The inner square is lighter than the outer circle.
• The outer circle is more dark than the inner square.

If the inner square becomes darker than the outer circle, the vaccine should be discarded.