Travellers wishing to enter the United States — including American citizens who have not been vaccinated against COVID-19— will now face stricter requirements, according to statements from the White House on Monday.

Those United States citizens who have been not vaccinated against COVID-19 so far will be required to produce a negative COVID test report, samples of which should have been taken a day before entering the country.

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According to reports from ANI citing officials from the administration of United States President Joe Biden, non-American citizens who have not yet received the COVID-19 vaccine will be permitted to enter the country but only in limited circumstances. Those who have been fully vaccinated against the disease and are citizens of the United States will need to get tested at least three days before travel.

The new mandate will begin on November 8, 2021.

For foreign nationals, the administration announced in September it will require all visitors to be fully vaccinated before entering the country, but on Monday outlined exemptions to that requirement.

People coming from countries with vaccination rates under 10% will also have to provide a compelling reason for why they are travelling to the United States, a senior administration official said, according to reports from ANI.

Children under 18 will not be required to be fully vaccinated because of delays in making them eligible for vaccines in many places. They will still need to take a COVID-19 test unless they are 2 or younger.

Others who will be exempt from the vaccination requirement include people who participated in COVID-19 clinical trials, who had severe allergic reactions to the vaccines, or are from a country where shots are not widely available, according to reports from Associated Press.

The United States will accept any vaccine approved for regular or emergency use by the Food and Drug Administration or the World Health Organization. That includes Pfizer, Moderna, Johnson & Johnson, AstraZeneca and China’s Sinopharm and Sinovac vaccines. Mixing and matching of approved shots will be permitted.