Union of https://www.ehealth.fgov.be/standards/fhir/vaccination/ValueSet/be-vs-vaccine-target-disease and https://www.ehealth.fgov.be/standards/fhir/vaccination/ValueSet/be-vs-vaccine-target-disease

This is the ValueSet that contains all the codes in BeVSVaccineTargetDisease (https://www.ehealth.fgov.be/standards/fhir/vaccination/ValueSet/be-vs-vaccine-target-disease) and BeVSVaccineTargetDisease (https://www.ehealth.fgov.be/standards/fhir/vaccination/ValueSet/be-vs-vaccine-target-disease). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem