近2/3的美国人对快速上市的COVID-19疫苗抱有担忧，而实现群体免疫需70%的人群都接种疫苗

过去两周，两大冠状病毒疫苗疗效的正面消息带来了鼓舞。辉瑞最终试验结果显示其疫苗的成功率为95%。Moderna本周表示，其疫苗的初步数据显示有效性为94.5%。

虽然最初的一波免费疫苗很可能会提供给该国最脆弱的人群，但想要达到群体免疫来有效减缓病毒的传播，需要约70%的人群都接种疫苗。

为了实现这70%目标的，有人提出了付钱给美国人打疫苗的想法。曾在克林顿总统政府任职的经济学家Robert Litan在8月首次提出，政府花费2750亿美元向美国人每人支付1000美元，以达到80%的群体免疫力。

根据盖洛普最近的一项民意调查，58%的美国人表示他们会在10月接种疫苗，高于9月疫苗还没有结果时期的50%。而根据雅虎财经10月进行的一项民意调查：近三分之二的美国人对 "战速行动 "的产物--快速上市的COVID-19疫苗抱有担忧。

Litan继续说：“虽然免费疫苗是美国人最好的选择，不过作为B计划，应该为不愿注射疫苗的美国人提供经济激励，以达到群体免疫的效果。”

The past two weeks have brought a rush of positive news about coronavirus vaccine efficacy from two of the big frontrunners in development. Pfizer said this week its final trial results showed its vaccine had a 95% success rate (coming a week after initial results showed the vaccine was more than 90% effective.) Moderna this week said preliminary data for its vaccine showed 94.5% effectiveness.

While the initial wave of free vaccines will most likely go to the country’s most vulnerable populations, reaching herd immunity to effectively slow the spread of the virus requires that about 70% of the population be vaccinated.

The idea of paying Americans to take the vaccine has been floated as a way to achieve that 70% goal. Robert Litan, an economist who served in President Clinton’s administration, first proposed that the government spend $275 billion to pay Americans $1,000 each to reach 80% herd immunity in August.

According to a Yahoo Finance-Harris Poll conducted in October, nearly two-thirds of Americans have concerns about the fast-tracked COVID-19 vaccine, the product of Operation Warp Speed. However, skepticism might be easing: according to a recent Gallup poll, 58% of Americans said they would take the vaccine in October, up from 50% in September.

Free vaccines for Americans are the best option, said Litan, who is a non-resident senior fellow at the Brookings Institution. However as a Plan B, he said, financial incentives should be offered to Americans reluctant to take the vaccine in order to reach herd immunity.  source

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