This is the ValueSet that contains all the codes in Immunization Recommendation Target Disease Codes (http://hl7.org/fhir/ValueSet/immunization-recommendation-target-disease) and Immunization Recommendation Target Disease Codes (http://hl7.org/fhir/ValueSet/immunization-recommendation-target-disease). E.g. what you have to deal with if you get resources containing codes in either of them