Despite these challenges, two vaccine candidates have advanced to evaluation in human subjects in countries with endemic disease, and several potential vaccines are in earlier stages of development.
尽管面临挑战，两种登革候选疫苗已在登革热流行国家进行后期临床评价，一些其他候选疫苗尚处在较为初级的开发阶段。
Optimizing HIV vaccine manufacturing processes should help expedite the development and evaluation of promising vaccine candidates across the entire field.
寻找到最佳的HIV疫苗研制方法，在整个领域范围内，都将有力推动令人期待的HIV疫苗候选物的研发以及后期评估。
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