Dear Doctors: When my family tried to visit my parents at their assisted-living facility, we were turned away. I thought COVID-19 was going to be the reason, but it was because of a norovirus outbreak. What is that? Is it really so contagious?
Dear Reader: Norovirus refers to a group of viruses that are the leading cause of gastrointestinal illness in the United States, sickening 21 million people a year and sending more than 100,000 to the hospital.
