Which of the following OPV ls are usable?
Correct Answer: Only 1, 2
Description: Rules for VVM use in India Rules 1: If the inner square is lighter than the outer circle, the vaccine may be used (Vials 1, 2) Rules 2: If the inner square is the color as, or darker than, the outer circle, the vaccine must not be used (Vials 3, 4).
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