This is the ValueSet that contains all the codes in Vaccine Target Diseases - IPS (http://hl7.org/fhir/uv/ips/ValueSet/target-diseases-uv-ips) and Vaccination Target Disease (https://healthterminologies.gov.au/fhir/ValueSet/vaccination-target-disease-1). E.g. what you have to deal with if you get resources containing codes in either of them