BEIJING (AP) — China expanded its sweeping efforts on Monday to contain a dangerous new virus, extending the Lunar New Year holiday to keep the public at home and avoid spreading infection as the death toll rose to 81.

Mongolia closed its vast border with China, and Hong Kong and Malaysia announced they were barring entry to visitors from the Chinese province at the center of the outbreak following a warning by Chinese officials that the virus’ ability to spread was growing. Travel agencies were ordered to cancel group tours nationwide, adding to the rising economic losses.

Stock markets around the world were down sharply Monday as investors worried the outbreak could hurt the global economy.