The present invention relates to the field of (vector) vaccines, and especially to an enhanced arrangement of nucleotide sequences for expressing a Paramyxoviridae virus containing an exogenous gene of interest. The present invention further concerns related expression cassettes and vectors, which are suitable to express genes of interest, especially antigen encoding sequences. The viral vectors of the present invention are useful for producing an immunogenic composition or vaccine.本發明係關於(載體)疫苗領域，且特定言之係關於表現含有所關注外源性基因之副黏液病毒科(Paramyxoviridae)病毒之核苷酸序列之增強配置。本發明另外係關於適於表現所關注基因，尤指抗原編碼序列之相關表現盒及載體。本發明之該等病毒載體可用於產生免疫原性組合物或疫苗。
