Families are swabbing themselves as part of a study into how kids transmit SARS-CoV-2, the Associated Press reports.

The study, which is being led by Vanderbilt University researchers, has enrolled 2,000 families to whom researchers mail sample kits. As the AP reports, the families collect their own nasal swabs and, occasionally, blood and stool samples to send back to the researchers, as well as answer questionnaires.