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
'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