Major US stock indices closed on Monday predominantly decrease. Dow Jones Lost 0.49%, S & amp; P 500 - 0.19%, while the NASDAQ, by contrast, rose 0.45%. The decline is due to players' concerns about the new wave of Covid-19. In recent weeks, stock markets have been hitting new highs - investors were encouraged by news of successful vaccine trials from coronavirus. However, the current situation with the pandemic has weakened enthusiasm - the number of diseases continues to grow in different countries, and quarantine restrictions are tightening. It poses a threat for further economic recovery. In the United States in the past a new record for the daily number of infections was set on Saturday, which led to the introduction of new restrictive measures in California. According to NatWest Markets strategist James McCormick, the outlook for the American economy is deteriorating markedly, with the release of the vaccine will not be able to significantly change the situation.