Processing vocal recordings of infected but asymptomatic people reveals potential indicators of COVID-19. Kylie Foy writes for the MIT Lincoln Lab that it’s often easy to tell when colleagues are struggling with a cold — they sound sick. Maybe their voices are lower or have a nasally tone. Infections change the quality of our voices in various ways. But Lincoln Laboratory researchers are detecting these changes in COVID-19 patients even when these changes are too subtle for people to hear or even notice in themselves.