Testing Requirements for Travel to the U.S.? Here’s What to Know

How effective has the policy been?

It depends how you define success, said Jeremy Goldhaber-Fiebert, a professor of health policy at Stanford University. If success was reducing the number of infected people who flew to the United States, he said, the testing requirement achieved that.

“It certainly prevented people who tested positive from getting on planes and it almost certainly prevented some amount of transmission on aircraft and in airports,” he said.

The exact number of infected people who were prevented from boarding planes is unknown, however, because no one tracks whether a passenger cancels a flight because of Covid. Most of the evidence is anecdotal; lots of people have stories about testing positive before flying home.

If success means keeping new variants out of the country, then it failed, said Dr. William Morice, the chair of lab medicine and pathology at the Mayo Clinic.

“The reality is that none of these measures have prevented the rapid global spread of any variant of concern,” he said.

But if success was not preventing the arrival of new variants, but instead delaying their arrival so that hospitals and authorities could be more prepared, then it may have worked. Mark Jit, a professor of vaccine epidemiology at the London School of Hygiene and Tropical Medicine, who has studied the effectiveness of travel requirements, said that this is what testing does well.

“Testing can prevent the peak from being reached so quickly,” he said.

Still, once a variant is already widespread in a country, he found, a travel test has little effect.

Article source: https://www.nytimes.com/2022/05/19/travel/testing-requirement-flying-us-cdc.html