Nationally, less than 10% of people over the age of 12 have received a single vaccine dose.

在全国范围内，12岁以上的人口中只有不到10%的人接种过一剂疫苗。

First, one single vaccine will not get us out of this.

首先，单一疫苗不会让我们摆脱困境。

The US health authorities said six cases were detected among more than 6 million Americans who received the single dose vaccine.

美国卫生当局表示，在接种单剂疫苗的600多万美国人中发现了6例血栓病例。

But the odds are against a successful trial, they say, because other control measures such as quarantine could end the outbreak before a single vaccine dose can be administered.

但他们说，试验成功的可能性很小，因为隔离等其他控制措施可能会在接种一剂疫苗之前就结束疫情。