Those who are not US citizens or permanent residents, must be fully vaccinated at least two weeks before traveling and must present a negative test of covid-19 made a maximum of 24 hours before the trip. Both PCR and antigen will be accepted.
It should be noted that at the moment the United States only accepts vaccines authorized by the United States drug regulatory body (FDA) or the World Health Organization (WHO): Pfizer-BioNTech, Moderna, Johnson & Johnson, AstraZeneca, Sinopharm and Sinovac. This requirement excludes hundreds of millions of people in places like India, Russia, Mexico or Argentina, who have received the vaccine from other brands such as Sputnik V. However, approval of the Russian vaccine by the Russian Federation is expected shortly. The OMS.
Citizens or residents should not present proof of vaccination, but in that case the negative test must have been obtained only one day before the trip.
Travelers who have visited or transited high-risk countries in the previous 14 days will not be able to travel. There are exceptions for citizens and permanent residents of the United States who must provide proof of a negative test before traveling. You can find a list of high-risk countries at https://www.cdc.gov/coronavirus/2019-ncov/travelers/from-other-countries.html
There are more entry restrictions when traveling to the states of Alaska, California, Hawaii, Kansas, Maine, and New Hampshire.
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