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No, a Border Wall Won’t Stop Coronavirus


Responding to a tweet about the Covid-19 pandemic on Tuesday, President Donald Trump wrote, “We need the Wall more than ever!” Trump had made a similar assertion during a rally in South Carolina at the end of February as well. “One of the reasons the numbers are so good: We will do everything in our power to keep the infection and those carrying the infection from entering our country,” he said. “You’ve all seen the wall has gone up like magic.”

Despite Trump’s hardliner immigration rhetoric, infectious diseases do not, in fact, respect or abide by borders. And the physical barriers at the southern United States border can’t perform any magic when it comes to stopping the spread of the novel coronavirus.

In fact, research has shown that travel bans in general have limited impact on slowing the spread of disease unless transmission is also on the decline within a community itself. The Trump administration has touted its move in January to bar foreign nationals who had recently visited China, the epicenter of the outbreak, from entering the US, and to mandate two-week quarantines for US citizens returning from China. Analysis of flu data, including details about the 2009 H1N1 influenza outbreak, indicate that while air travel restrictions can delay the spread of a disease—a worthwhile goal—they typically don’t halt transmission. This is partly because air travel bans often go into effect too late and aren’t strict enough to truly halt all movement. Meanwhile, transmission often expands in affected communities as a result of ground travel.

Read all of our coronavirus coverage here.

New research on Covid-19 in particular found that international travel restrictions in and out of China during December and January may not have ultimately minimized spread. An international team of researchers found that China’s lockdown of Wuhan delayed the epidemic’s progression by just three to five days within China. It had a larger effect internationally, but still only added a delay of a few weeks. Again, buying whatever time you can matters so that you can “flatten the curve” of infections to avoid overwhelming the health care system. But the idea that a literal wall would stop coronavirus is fanciful at best.

“The construction of additional wall or fencing along the US-Mexico border is essentially irrelevant to the management of Covid-19,” says Christopher Wilson, deputy director of the Mexico Institute at the Wilson Center.

There are both general and specific reasons that the barrier wouldn’t play a significant role in the US’s pandemic mitigation. For one thing, the US-Mexico border has not been a focal point in the virus’s spread into the United States. On Monday, as the number of confirmed infections approached a thousand in the US, the Mexican Ministry of Health had only confirmed seven cases.

Doctors within Mexico are increasingly raising the alarm that this number likely under-represents the true number of cases in the country. But even if a wall were helpful in slowing the spread of disease, continuing to build out the US’s southern border defenses would help Mexico far more than the US. If anything, advancing the physical wall would make people less likely to get screened in the first place.

“The effectiveness of mass quarantine is disputed in general,” says Laurent Hébert-Dufresne, a researcher at the University of Vermont’s Complex Systems Center focused on contagion modeling. “Barriers, whether physical or legal, make it harder to track and test people which is never a good idea. The quarantine that is a good idea is self-imposed isolation, like people staying home or cancelling social events.”

Instead of prioritizing physical barriers at all, especially at the southern border, researchers say that the US should be focused on limiting Covid-19 spread at ports of entry around the country through screening and home quarantine orders. “There are over a million legal border crossings happening every day at the US-Mexico border,” says Wilson. “In fiscal year 2019 there were just under a million unauthorized border crossings apprehended all year.”



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