The United States will require all airline passengers arriving from Britain to test negative for the coronavirus within 72 hours of their departure, the Centers for Disease Control and Prevention said on Thursday.
The move comes as a new highly transmissible variant of the virus, which first appeared in Britain, has led more than 50 countries to seal their borders to travelers from there or to impose restrictions on their arrival.
The new rule, which takes effect on Monday, will apply to Americans as well as foreign citizens, and will require passengers to show proof of a negative result on a genetic test, known as a P.C.R., or an antigen test.
“This additional testing requirement will fortify our protection of the American public to improve their health and safety and ensure responsible international travel,” the C.D.C. said in a statement.
Passengers will be required to “provide written documentation of their laboratory test result (in hard copy or electronic) to the airline,” the C.D.C. said, adding that “if a passenger chooses not to take a test, the airline must deny boarding to the passenger.”
The new rules were a reversal for the Trump administration, which initially told American airliners that the government would not require testing for travelers from Britain.
United Airlines, Virgin Atlantic and Delta Air Lines had already announced similar policies, requiring all passengers on their flights between Britain and the United States to submit proof of a negative test result within 72 hours of departure. British Airways had also been requiring negative test results for passengers arriving in New York.
The announcement from the United States adds another layer of difficulty for Britons hoping to travel. Nonessential travel will also be banned within much of Britain starting on Saturday, new restrictions further limit socializing, and schools and universities might soon have to close.
The British Foreign Office updated its travel advice online on Friday to warn travelers of the new testing requirement. “We are in close contact with U.S. authorities and working urgently to minimize disruption as far as possible,” the office said in a statement. “British travelers should follow the U.S. authorities’ guidance, and speak to their airlines for the latest travel options in the first instance.”
People traveling immediately after the holiday may face uncertainty: Many private testing clinics and labs are closed on Christmas Day, so testing within the 72-hour window may prove difficult, especially for the P.C.R. screening, which must be sent to a lab and can take several days to process.
The rapid antigen test, a relatively new tool to detect the virus, gives a result in around 30 minutes, but it is not as widely available, although it is cheaper. Heathrow Airport, for example, charges passengers about $130 for P.C.R. results with 48 hours and about $60 for antigen tests with results within 45 minutes.
Both tests are offered at major British airports — including Heathrow and Gatwick, London’s two major hubs, and Manchester Airport — but passengers must register in advance. It was unclear how many would be able to procure a test and get a result in time for travel.
The introduction of new travel restrictions led to concerns that travelers to the United States would flock to the airport, as Londoners did at train stations last Saturday when tighter domestic rules were announced. But employees at Heathrow on Friday described a normal, if quieter, stream of passengers typical of Christmas Day, with most appearing to travel on long-haul flights.
The Coronavirus Outbreak ›
Words to Know About Testing
Confused by the terms about coronavirus testing? Let us help:
- Antibody: A protein produced by the immune system that can recognize and attach precisely to specific kinds of viruses, bacteria, or other invaders.
- Antibody test/serology test: A test that detects antibodies specific to the coronavirus. Antibodies begin to appear in the blood about a week after the coronavirus has infected the body. Because antibodies take so long to develop, an antibody test can’t reliably diagnose an ongoing infection. But it can identify people who have been exposed to the coronavirus in the past.
- Antigen test: This test detects bits of coronavirus proteins called antigens. Antigen tests are fast, taking as little as five minutes, but are less accurate than tests that detect genetic material from the virus.
- Coronavirus: Any virus that belongs to the Orthocoronavirinae family of viruses. The coronavirus that causes Covid-19 is known as SARS-CoV-2.
- Covid-19: The disease caused by the new coronavirus. The name is short for coronavirus disease 2019.
- Isolation and quarantine: Isolation is the separation of people who know they are sick with a contagious disease from those who are not sick. Quarantine refers to restricting the movement of people who have been exposed to a virus.
- Nasopharyngeal swab: A long, flexible stick, tipped with a soft swab, that is inserted deep into the nose to get samples from the space where the nasal cavity meets the throat. Samples for coronavirus tests can also be collected with swabs that do not go as deep into the nose — sometimes called nasal swabs — or oral or throat swabs.
- Polymerase Chain Reaction (PCR): Scientists use PCR to make millions of copies of genetic material in a sample. Tests that use PCR enable researchers to detect the coronavirus even when it is scarce.
- Viral load: The amount of virus in a person’s body. In people infected by the coronavirus, the viral load may peak before they start to show symptoms, if symptoms appear at all.
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