This is the ValueSet that contains all the codes in DDCC Codes for ICAO Vaccines (http://smart.who.int/ddcc/ValueSet/ICAOV1ValueSet) and DDCC Codes for ICAO Vaccines (http://smart.who.int/ddcc/ValueSet/ICAOV1ValueSet). E.g. what you have to deal with if you get resources containing codes in either of them