On Sept 1, the pharmaceutical company Sanofi Pasteur announced that it was withdrawing from development of a vaccine against Zika virus infection. This announcement raises concerns about the future of Zika virus vaccine development, at a time when the number of cases is falling and other questions about the virus remain unanswered.

中文翻译：

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寨卡病毒疫苗必须保持优先地位

9月1日，制药公司赛诺菲巴斯德（Sanofi Pasteur）宣布，其正在开发针对寨卡病毒感染的疫苗。这一宣布引起人们对寨卡病毒疫苗开发的未来的担忧，当时病例数正在下降，有关该病毒的其他问题仍未得到解答。