Dow plunges 1,191 points on coronavirus fears, while S&P 500 posts its worst day since 2011

· *All major US equity indexes plunged more than 4.4% on Thursday, with each entering correction territory.*
· *That means they've both fallen more than 10% from recent highs.*
· *The Stoxx Europe 600 also entered correction territory.*
· *The S&P 500's 4.4% decline marked its biggest since August 2011, while the Dow...