This is the ValueSet that contains all the codes in BR Categoria Agente Alergias Reacoes Adversas (https://terminologia.saude.gov.br/fhir/ValueSet/BRCategoriaAgenteAlergiasReacoesAdversas) and BR Categoria Agente Alergias Reacoes Adversas (https://terminologia.saude.gov.br/fhir/ValueSet/BRCategoriaAgenteAlergiasReacoesAdversas). E.g. what you have to deal with if you get resources containing codes in either of them