To get at these non-mutating parts of the virus, Nabel and his colleagues used a two-step vaccination process, called "prime-boost."
为了在病毒中分离这种“非变异”成分,内伯尔和他的同事们使用一个两步接种过程。
3
Dr Gary Nabel, the study leader from the us National Institute of Allergy and Infectious Diseases in Bethesda, Maryland, said: "We are excited by these results."