Researchers say they've developed a low-cost swab test that can diagnose COVID-19 infections in about 45 minutes. The CRISPR-based test -- which uses gene-targeting technology and requires no specialized equipment -- could help relieve testing backlogs in the United States as COVID-19 continues to spread, the scientists said. The U.S. Food and Drug Administration has not approved the test, but clinical assessments are being conducted in an effort to fast-track approval. The test is described in a paper published April 16 in the journal Nature Biotechnology.