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FDA Grants Emergency Use Authorization For First Coronavirus Antigen Test
The U.S. Food and Drug Administration building behind FDA logos at a bus stop on the agency's campus in Silver Spring, Md. in 2018. (Jacquelyn Martin/ AP)
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The Food and Drug Administration has announced its first emergency authorization for a new type of an antigen test that can detect the coronavirus.
The test looks for protein fragments associated with the virus. The sample is collected with a nasal swab that can produce a result in minutes, the FDA said in a statement. The agency notes that compared to already approved genetic testing, the antigen test is cheaper and easier to use and could "potentially scale to test millions of Americans per day," once multiple manufacturers enter the market.
So far, only San Diego-based Quidel Corporation has received authorization for the tests. That authorization was granted late Friday.
Two other types of tests for the coronavirus have received emergency authorization. One, called a polymerase chain reaction, or PCR test, is a molecular diagnostic tool that identifies the virus' genetic material. The other is an antibody test.
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Antigen testing is not without its shortcomings. The FDA notes the test is less reliable at ruling out infection in patients, and that negative results "may need to be confirmed with a PCR test prior to making treatment decisions or to prevent the possible spread of the virus due to a false negative."
The agency said:
"Antigen tests are very specific for the virus, but are not as sensitive as molecular PCR tests. This means that positive results from antigen tests are highly accurate, but there is a higher chance of false negatives, so negative results do not rule out infection."
READ MORE ON TESTING
- Coronavirus antibody tests explained: what are they and do they work? (The Guardian)
- What Antibody Studies Can Tell You — and More Importantly, What They Can’t (ProPublica)
Copyright 2020 NPR. To see more, visit https://www.npr.org.
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