Health care workers in Houston, Texas, perform a procedure on a patient in the COVID-19 intensive care unit on Thanksgiving. This past week has seen continued steep growth in cases, hospitalizations and deaths from COVID-19. Go Nakamura/Getty Images hide caption
As students return to college campuses, the surrounding communities are seeing an increase in coronavirus infections. Michael Conroy/AP hide caption
'Disease tolerance' is the ability of an individual, due to a genetic predisposition or some aspect of behavior or lifestyle, to thrive despite being infected with an amount of pathogen that sickens others. It might play a role in asymptomatic coronavirus infections. Alexander Spatari/Getty Images hide caption