Watch live: CNBC's special coverage on the coronavirus

Watch CNBC's live coverage as stock futures plunged Sunday night even after the Federal Reserve embarked on a massive monetary stimulus campaign to curb slower economic growth amid the coronavirus outbreak.

While the central bank's actions may help ease the functioning of markets, many investors said they would ultimately want to see coronavirus cases peaking and falling in the U.S. before it was safe to take on risk and buy equities again.