A trial of a therapeutic vaccine against HIV induces cellular immunity and, although it provides hope, it highlights the hurdles for the development of such strategies.

中文翻译：

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在开发HIV疫苗方面迈出了小步。

一项针对HIV的治疗性疫苗的试验可诱导细胞免疫，尽管它提供了希望，但它突显了制定此类策略的障碍。