US shares revved higher on Monday on news a coronavirus vaccine had shown 90 percent effectiveness, but after blasting through records early in the session, Wall Street closed with more modest gains. The bellwether Dow Jones Industrial Average jumped over 830 points or 2.95 percent to finish the day at 29,157.97, while the broader S&P 500 rose 1.1 percent to 3,550.5, about 30 points shy of a record. But the tech-heavy Nasdaq reversed early gains and slipped 0.7 percent to close at 11,713.78, as firms that benefitted from the pandemic lost ground, including Zoom and Netflix. hs/ec