Which of the following OPV ls are usable?
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).
Only 1
Only 1, 2
Only 1, 2, 3
Only 3, 4
Cold Chain in India