This is the CodeSystem that contains all the codes in BRImunobiologico (https://terminologia.saude.gov.br/fhir/CodeSystem/BRImunobiologico) and BRImunobiologico (https://terminologia.saude.gov.br/fhir/CodeSystem/BRImunobiologico). E.g. what you have to deal with if you get resources containing codes in either of them