Scientists at Northern Arizona University’s Pathogen and Microbiome Institute are tracking the coronavirus in an unusual way—by taking samples of sewage. In places where people are infected, the virus ends up in untreated wastewater. The scientists are sampling the virus’ genetic material in the greater Flagstaff area and on the Navajo Nation to see if they can quickly pinpoint spikes in the disease. In KNAU’s weekly update on the science of COVID-19, Melissa Sevigny spoke with infectious disease expert Dr. Crystal Hepp about the research.