研究人员称，要求在餐馆吃饭、看电影或参加其他室内集体活动时出示新冠肺炎疫苗接种证明可能会产生连锁反应。

周一发表在《柳叶刀公共卫生》上的一项研究发现，一些实施“新冠肺炎认证”的国家，如提供完整疫苗接种证明的疫苗护照、新冠肺炎检测阴性证明或新冠肺炎康复证明，接种疫苗的人数有所增加。

这项研究调查了法国、以色列、意大利、瑞士、丹麦和德国的疫苗接种率，这些国家都强制要求获得此类认证。研究发现，一旦相关规定出台，疫苗接种数量将大幅增加。

“总的来说，我们观察到，预计限制措施将在引入前20天左右实施，并在引入后持续长达40天，这种情况大幅上升，”牛津大学勒维尔乌尔姆人口科学中心主任、该研究的主要作者梅林达·米尔斯(Melinda Mills)在一份声明中表示。

达米安·多瓦尔甘内斯/美联社

服务员胡安·罗德里格斯(左)要求顾客在进入前出示疫苗接种卡...

研究人员表示，数据显示，每百万人接种疫苗的数量大幅增加:法国12.7万人，以色列超过24.3万人，瑞士超过6.4万人，意大利超过6.6万人。

研究发现，30岁以下人群的疫苗接种显著增加。研究人员认为，新冠肺炎认证用于休闲和酒店场所，如夜总会，可能会加速年轻人的激增。

该研究的合著者之一托拜厄斯·吕特瑙尔博士在一份声明中说:“我们知道，某些群体的疫苗接种率低于其他群体，这可能是鼓励年轻人和男性等疫苗自满群体接种疫苗的一种有用方式。”。

研究人员指出，这项研究有一些局限性。例如，没有可用的数据来检查社会人口、性别和种族群体对疫苗的吸收情况。研究人员还承认，他们担心新冠肺炎认证会增加“某些族裔或社会经济群体之间不平等加剧的风险，这些群体对当局的理解和信任程度较低。”

该研究建议，应该使用其他措施来补充新冠肺炎认证，例如针对犹豫不决的群体的疫苗运动。

研究人员写道:“新冠肺炎认证只是一系列多重政策杠杆的一部分，这些政策杠杆可以用来对抗疫苗的自满和犹豫，并提高疫苗的使用率。”。

任何需要帮助安排免费疫苗预约的人都可以登录vaccines.gov

COVID vaccination requirements may successfully increase vaccination rates: Study

Requiring proof of a COVID-19 vaccination to eat at a restaurant, go to a movie or take part in other indoor group activities may have a ripple effect, according to researchers.

A study published Monday in Lancet Public Health found that some countries that implemented "COVID-19 certifications" such as vaccine passports providing proof of complete vaccination, a negative COVID-19 test or a COVID-19 recovery certificate saw an increase in the number of people getting their shots.

The study, which looked at vaccination rates in France, Israel, Italy, Switzerland, Denmark and Germany where such certifications were made mandatory, found there were major jumps in the number of vaccine doses given once the rules were put in place.

"Overall, we observed a significant uptick in anticipation of restrictions coming into place around 20 days before introduction, which lasted up to 40 days after," Melinda Mills, director of the Leverhulme Centre for Demographic Science at the University of Oxford and the study's lead author, said in a statement.

Researchers said the data showed a significant increase in the number of vaccine doses per million people: 127,000 in France, over 243,000 in Israel, over 64,000 in Switzerland and over 66,000 in Italy.

There was a significant increase in vaccinations among people under 30, the study found. Researchers believe COVID-19 certifications used at leisure and hospitality spots, such as nightclubs, likely precipitated the jump in younger people.

"We know that certain groups have lower vaccine uptake than others and it may be that COVID-19 certification is a useful way to encourage vaccine complacent groups, like young people and men, to get vaccinated," Dr Tobias Rüttenauer, one of the study's co-authors, said in a statement.

Researchers noted the study had some limitations. For instance, there was no data available to examine vaccine uptake by sociodemographic, gender and ethnic groups. Researchers also acknowledged concerns that COVID-19 certifications raises the "risk of exacerbating inequalities among certain ethnic or socioeconomic groups that have lower uptake and trust in authorities."

The study recommends that other measures should be used to complement the COVID-19 certification, such as vaccine drives targeted at hesitant groups.

"COVID-19 certification is only part of a constellation of multiple policy levers that could be used to counter vaccine complacency and hesitancy and increase uptake," the researchers wrote.

Anyone who needs help scheduling a free vaccine appointment can log ontovaccines.gov.