This is the ValueSet that contains all the codes in WHO Speciman Sample Origin (COVID-19) (http://smart.who.int/ddcc/ValueSet/WHODDCCSampleOriginCOVID19) and WHO Speciman Sample Origin (COVID-19) (http://smart.who.int/ddcc/ValueSet/WHODDCCSampleOriginCOVID19). E.g. what you have to deal with if you get resources containing codes in either of them