<prompt> Open Vial Policy apply to which vaccineMeaslesBCGJapanese encephalitis vaccineHepatitis B  <response>: The WHO multi-dose l policy states that ls of liquid DTP, TT, HepB and OPV opened in a fixed clinic may be used at more than one immunization session provided that: A The expiry date has not passed. B The vaccines are stored under appropriate cold chain conditionsPark pg no: 117 