Results of the STOPCovid test appear as a single or double line on a paper strip akin to a pregnancy test. In this photo, test strips showing a single line (left panel) indicate no infection. Test strips revealing double lines (right panel) indicate the presence of the virus.
Credit: Abudayyeh-Gootenberg lab, McGovern Institute for Brain Research at MIT and Zhang lab, McGovern Institute/Broad Institute