DR. SANJAY GUPTA: I WON'T BE VISITING WITH FAMILY THIS THANKSGIVING. YOU SHOULDN'T EITHER.

The country saw it after Memorial Day, the Fourth of July and Labor Day: spikes in Covid-19 cases in parts of the country a few weeks after Americans gathered with family and friends to celebrate. We were warned each time. © Shutterstock Some of us told ourselves that we were fatigued from the spring lockdown (true), the weather was finally warming up (true), we had done so well keepi...