Between now and the next few weeks. And if you are infected, step by step guidance on what to do. Our expects live in the studio, answering your questions. Pandemic what you need to know. Heres david muir. Good evening and thank you for joining us for this special live 20 20. And as we come on the air tonight, much of america shutting down. Late today, President Trump issuing new nationwide guidelines for americans across this country, in the fight against the coronavirus. The outbreak spreading across the u. S. More than 1,300 new cases in just the last 24 hours and thats without testing fully up to speed. In total, more than 4,600 cases in 49 states. At least 82 deaths. Late today, the president urging americans not to gather in groups larger than ten. And to avoid restaurants and bars. And he said the u. S. Could be dealing with this right into the summer. Tonight, a major lockdown has been declared in the San Francisco area. Nearly 7 Million People in several california counties ha