You're probably right about the full blown panic, but it won't take long for people to realize the fatality rate is significantly lower than what the initial numbers were showing, comparable to the flu at .1%. The fed will add a few notches to their good ol' balance sheet and pump the markets up. They'll start cutting checks to everyone for rent support and add liquidity to the markets directly or indirectly. Businesses will open back up and things will return back to normal, just 50% off highs. Eventually a vaccine will come out but I think people will calm down far before that happens.
Fatality rate DOES NOT MATTER. It is the number of new infections that matters to the markets.