12月6日，美国疾病控制与预防中心开始要求2周岁及以上的旅客进入美国前一天内进行COVID-19病毒检测。所有到达美国的航空旅客必须出示登机前一天内进行的COVID-19检测阴性结果，无论其免疫接种状态或国籍。您必须在登机前向航空公司出示您的阴性检测结果。
如果您最近感染过COVID-19并康复，您可以在旅行时携带COVID-19康复证明文件（即基于航班从外国起飞前90天内采样得出的COVID-19病毒检测阳性结果，以及由持牌医疗卫生服务提供方或公共卫生官员出具的表明您已符合旅行要求的信函)。
这些要求适用于所有从外国到达美国的2周岁及以上的航空旅客。
拜登总统已承诺采取一切必要措施保护美国人的安全并战胜COVID-19大流行，并且这些步骤乃美国政府的医学专家和COVID-19响应团队所建议。
访问美国驻华大使馆关于COVID-19的网页，了解中华人民共和国的相关情况。关于COVID-19的信息 - 美国驻华大使馆和领事馆 (usembassy-china.org.cn) ：
https://china.usembassy-china.org.cn/covid-19-information/
On December 6, the U.S. Centers for Disease Control and Prevention (CDC) implemented a one-day COVID-19 testing requirement for travelers over age two coming to the United States.  Regardless of vaccination status or nationality, any individual coming to the United States must show a negative pre-departure COVID-19 viral test taken within one day of the flight’s departure to the United States.  You must show your negative result to the airline before you board.
If you recently recovered from COVID-19, you may instead travel with documentation of recovery from COVID-19 (i.e., your positive COVID-19 viral test result on a sample taken no more than 90 days before the flight’s departure from a foreign country, and a letter from a licensed healthcare provider or a public health official stating that you were cleared to travel).
These requirements are for all air passengers two years of age or older boarding a flight from a foreign country to the United States.
President Biden has promised to take every measure necessary to keep Americans safe and defeat the pandemic, and these were steps recommended by U.S. government medical experts and the COVID-19 Response Team.
Visit the U.S. Embassy Beijing webpage on COVID-19 for information on conditions in The People's Republic of China. COVID-19 Information - U.S. Embassy & Consulates in China (usembassy-china.org.cn): 
https://china.usembassy-china.org.cn/covid-19-information/
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