President Trump Thursday defended his new policy that, for 30 days, will bar most travelers arriving to the U.S. from much of Europe. Trump says coronavirus cases from the continent have been seeding outbreaks in the United States. The travel ban, he says, will save American lives.

The new restrictions which apply to 26 countries in Europe (but not the United Kingdom) came as a surprise to many E.U. leaders when Trump announced them. They also came as a surprise to many public health experts.

“From a public health perspective, it’s remarkably pointless,” says Francois Balloux, an epidemiologist at University College London who worked with the World Health Organization on the 2009 H1N1 flu pandemic. Balloux says closing borders only works in the very early days of an outbreak, or for countries that haven’t yet detected any cases at all. The U.S., as of Thursday afternoon, had confirmed 1,323 cases.

“If you bring in one or two additional people — once you’ve lost completely the ability to do any contact tracing — it won’t make any difference,” Balloux says. The U.S. is in that position now, he says, with far too many cases than it can possibly trace. Balloux calls the new travel restrictions — which are to go into full effect at 11:59 EDT Friday — a distraction.

Travel bans, border closures and burdensome quarantines of arriving foreigners have been staples of the COVID-19 pandemic. Nations around the world have wielded them with little consistency during this international health crisis.

Last week Israel essentially sealed its borders with the world, declaring that anyone arriving from abroad would have to spend two weeks in quarantine.

Saudi Arabia slapped in place a ban on visitors from 14 countries so quickly that airlines, which already had planes en route to the kingdom, had to sort their passengers by nationality, and ultimately fly many of them someplace else.

South Korea and Japan instituted tit for tat restrictions on each other’s citizens as the outbreak heated up in that part of Asia late in February.

A month earlier, on Jan. 31, as the coronavirus outbreak raged in Wuhan. The U.S. announced that it was barring anyone who had been in China in the previous 14 days from entering the U.S. Dozens of other countries also blocked travelers from China. Researchers in Australia say that the country’s ban on travelers from China was highly successful at limiting the number of coronavirus cases there.

From the beginning, since the first outbreaks became widely known, the World Health Organization has advised against blanket travel bans. The WHO has also warned that travel bans could violate the International Health Regulations.

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