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COVID-19

$5 COVID test, DIY-style, may be on the way

Scott Tong Feb 25, 2021
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They're known as rapid antigen tests. Right now there is no cheap, at-home version available in the United States without a prescription, but several applications are in the queue before the FDA. Pictured: A rapid antigen test in Spain. Pablo Blazquez Dominguez/Getty Images
COVID-19

$5 COVID test, DIY-style, may be on the way

Scott Tong Feb 25, 2021
Heard on:
They're known as rapid antigen tests. Right now there is no cheap, at-home version available in the United States without a prescription, but several applications are in the queue before the FDA. Pictured: A rapid antigen test in Spain. Pablo Blazquez Dominguez/Getty Images
HTML EMBED:
COPY

As coronavirus vaccinations begin and economies around the world seek new ways of opening up safely, a new kind of virus test stands on the verge of going big: a half-hour, at-home test you can do without a prescription.

Price tag: around $5.

They’re known as rapid antigen tests. Right now, there is no cheap, at-home version available in the United States without a prescription, but several applications are in the queue before the Food and Drug Administration.

One country leading the effort to deploy rapid antigen tests is the United Kingdom, where Marketplace’s editorial partners at the BBC use them. In the course of reporting this story, I spoke with BBC reporter Vishala Sri-Pathma as she was doing one herself.

“So you open your mouth wide and you rub the fabric tip of the swab over both your tonsils. So I’m just gonna do that now,” Sri-Pathma told me over Zoom audio. She then swabbed her nose, stuck the swab into a tiny vial of liquid and dripped the solution into a simple plastic device that she said resembled a pregnancy test.

“So you’ve got to squeeze very carefully, two drops,” Sri-Pathma said. “OK.” And that was it. The results would come in half an hour.

The quick antigen tests use what’s called lateral flow technology, as the liquid sample travels along a lateral strip inside the device. The U.K. government wants to send these tests around the country, in a campaign that began last fall in Liverpool.

“It’s only three weeks ago that we had 680 people per 100,000 COVID positive,” Liverpool Mayor Joe Anderson said in a mid-November interview with Channel 4 News in the U.K. “That is down to below 300. And it means that there’s less pressure on our ICU units.”

How does this test work? Whereas lab tests known as PCR are designed to turn up genetic footprints of the virus, antigen tests hunt for proteins produced during an active infection.

“It’s really a contagiousness test,” said Mara Aspinall, professor of practice in biomedical diagnostics at Arizona State University. She noted that antigen tests provide speedier results than PCR, which can take days.

“If you take it 15 minutes before you go see a higher-risk person, it is highly, highly likely that you are not contagious,” Aspinall said.

There are trade-offs. Studies have found antigen tests miss some cases that are picked up by PCR tests. There is a heated debate among scientists as to how relevant — or marginal — those missed cases are.

Also, a person conducting a rapid antigen test at home may not know how to respond to a positive result.

“It may induce panic,” said immunologist David Harris at the University of Arizona, “and the individual says, ‘Now I’m infected and I’m gonna die.’ And they rush into the already overwhelmed medical system. At least half the people who get infected never need medical care.”

Harris oversees daily antigen testing for the university football and basketball teams. “The only positives we’ve had on either teams have been coaches,” he said.

Workers at factories, supermarkets and airports also take these tests in countries including the U.K. And there are other potential economic possibilities.

“Opening schools, opening mines,” said Sergio Carmona, chief medical officer at the Foundation for Innovative New Diagnostics in Geneva. “And border crossings where truck drivers would need to cross and deliver goods.”

COVID-19 Economy FAQs

What do vaccines mean for economic recovery?

COVID-19 is not going anywhere anytime soon, according to expert witnesses who testified at a recent hearing held by the Joint Economic Committee. Put simply, we can’t eradicate the virus because it infects other species, and there will also be folks who choose not to get the vaccine or don’t mount an immune response, according to Dr. Céline Gounder at NYU School of Medicine & Bellevue Hospital. “That means we can’t only rely on vaccination,” Gounder said. She said the four phases of recovering from the pandemic are ending the emergency, relaxing mitigation measures, getting to herd immunity and having long-term control.

Can businesses deny you entry if you don’t have a vaccine passport?

As more Americans get vaccinated against COVID-19 and the economy begins reopening, some businesses are requiring proof of vaccination to enter their premises. The concept of a vaccine passport has raised ethical questions about data privacy and potential discrimination against the unvaccinated. However, legal experts say businesses have the right to deny entrance to those who can’t show proof.

What do I need to know about tax season this year?

Glad you asked! We have a whole separate FAQ section on that. Some quick hits: The deadline has been extended from April 15 to May 17 for individuals. Also, millions of people received unemployment benefits in 2020 — up to $10,200 of which will now be tax-free for those with an adjusted gross income of less than $150,000. And, for those who filed before the American Rescue Plan passed, simply put, you do not need to file an amended return at the moment. Find answers to the rest of your questions here.

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