Sticker puts simple COVID-19 test on masks UC San Diego receives $1.3 million for development Researchers at UC San Diego have developed a simple COVID test that fits on a small sticker on a mask. They say it can be a good early indicator of risk for exposure. and last updated 2021-01-21 10:17:18-05 SAN DIEGO (KGTV) - Researchers at UC San Diego's School of Engineering have created a way to test for COVID-19 risk that is so simple, it can be worn as a sticker on your mask. "This could have a really profound impact on the trajectory of the pandemic," says Jesse Jokerst, an Associate Professor at UC San Diego.