Wall Street tumbles as new Covid strain raises fears of economic disruption

Wall Street's main indexes fell on Monday, as a more-virulent strain of the coronavirus in Britain sparked fears of fresh disruptions and weighed on investors' expectations of a vaccine-led economic rebound.The strain, which is said to be up to 70% more transmissible than the original, forced many countries to shut their borders with the United Kingdom.
 
All the 11 major S&P sub-indexes fell, with energy shares leading declines as crude prices slipped on concerns of waning fuel demand. Chevron Corp, Exxon Mobil Corp and Occidental Petroleum Corp dropped between 2% and 5% in early trading.
 
Travel-related stocks, among