This is the ValueSet that contains all the codes in WHO PreQualificaiton VaccineType (http://smart.who.int/pcmt-vaxprequal/ValueSet/PreQualVaccineType) and WHO PreQualificaiton VaccineType (http://smart.who.int/pcmt-vaxprequal/ValueSet/PreQualVaccineType). E.g. what you have to deal with if you get resources containing codes in either of them