在网上搜了一下，这里好像是官方说法： https://www.nafsa.org/regulatory-information/covid-vaccine-and-test-requirements-us-entry-0 A separate CDC order also continues to require all air travelers (regardless of citizenship) to show results of a negative coronavirus test performed on a specimen taken three days (if fully vaccinated) or one day (if not fully vaccinated and entering under an exception) preceding their flight's departure from a foreign country traveling to the United States. "Noncitizens who are nonimmigrants" who are traveling by air will have to show both the negative COVID viral test and documentation that they are either fully vaccinated or are eligible for an exception to the vaccination requirement.
谢谢，打过北京科兴的疫苗后就不需要打打第三针疫苗了？
国内可以打到辉瑞的疫苗吗？
国内打得科兴，到美国以后再打辉瑞
A separate CDC order also continues to require all air travelers (regardless of citizenship) to show results of a negative coronavirus test performed on a specimen taken three days (if fully vaccinated) or one day (if not fully vaccinated and entering under an exception) preceding their flight's departure from a foreign country traveling to the United States.
"Noncitizens who are nonimmigrants" who are traveling by air will have to show both the negative COVID viral test and documentation that they are either fully vaccinated or are eligible for an exception to the vaccination requirement.
好的，多谢你耐心回答🙏
第三针再打科兴的？谢谢妹妹🌻