A top federal health official is issuing a dire warning: Follow recommended coronavirus measures or risk having the worst fall in US public health history. Coronavirus has infected more than 5 million people and killed over 166,000 nationwide, according to Johns Hopkins University. On Wednesday alone, there were 55,910 reported new cases and 1,499 deaths -- the highest number of fatalities since May. "For your country right now and for the war that we're in against Covid, I'm asking you to do four simple things: wear a mask, social distance, wash your hands and be smart about crowds," said Dr. Robert Redfield, director of the Centers for Disease Control and Prevention. "I'm not asking some of America to do it," he told WebMD. "We all gotta do it." Without following the recommendations, this could be "the worst fall, from a public health perspective, we've ever had," he said. In addition to taking measures to combat the pandemic, people should also get a flu vaccine.