On July 1, the United States surpassed 50,000 coronavirus cases in a single day — the highest daily number since the pandemic began. Epidemiologist Michael Osterholm, Director of the Center for Infectious Disease Research and Policy at the University of Minnesota, joins CBS News' national consumer investigative correspondent Anna Werner to discuss why he says we are only at "the 100 yard mark in the marathon." Dr. Osterholm tells Werner we have to be better prepared because, "the worst is yet to come." He shares the reality of when to expect a vaccine and explains why all masks are not equal and why people should stay 10 to 12 feet apart — not six feet. Plus, Osterholm offers tips on safe ways to enjoy the Fourth of July.