European stocks opened lower, tracking losses for U.S. stock futures as investor concern grew over climbing cases of the coronavirus in America. The Stoxx Europe 600 index fell 1.7% to 315.96, with the FTSE 100 index out in front with a 3.1% drop to 5,634.43. Dow Jones Industrial Average stock futures fell 248 points, or 1.1%, to 22,105, while S&P 500 and Nasdaq-100 futures dropped over 1% each. Losses come after the Dow industrials re-entered bull-market territory on Thursday, with a gain of more than 6%, while the Stoxx Europe 600 rose 2.7%. The U.S. now has the most cases of coronavirus in the world, passing China with more than 85,000 cases.