Stocks stumble on renewed coronavirus worries

A late-afternoon slide on Wall Street dragged stocks broadly lower Wednesday, wiping out early gains and adding to losses from a day earlier as investors worry about the economic fallout from surging coronavirus cases in the U.S. The S&P 500 fell 1.16%. It had been up 0.3% in the early going after Pfizer and BioNTech reported updated data suggesting their potential covid-19 vaccine may be 95% effective. The companies said they plan to ask U.S. regulators within days to allow emergency use of the vaccine. The news, which followed encouraging data on Monday about a vaccine being developed by Moderna, initially gave investors cause...