Coronavirus cases continue to surge in China while new infections are being reported around the world. Stock markets in China, reopening after the Lunar New Year holiday, recorded their sharpest falls in more than four years on Monday, reflecting increasing concern about the damage the outbreak is inflicting on the local economy. Here’s what we know:

● China’s National Health Commission reported Monday that there are 17,228 confirmed cases in China, including 15 in Hong Kong and eight in Macao. The self-governing island of Taiwan reported 10 cases. The World Health Organization reported 146 confirmed cases in 23 countries outside China.

● China’s main share indexes plunged more than 8 percent, reopening after a 10-day break, as economists continue to revise growth forecasts downward.

● Hong Kong has closed nearly all its border crossings with mainland China. Concerns are also rising about possible outbreaks in Japan and South Korea after indications of tertiary transmissions of the virus there.

● China’s new “super-fast” hospital, built in just eight days, has opened in Wuhan. With 1,000 beds, it will relieve pressure on Wuhan’s overwhelmed medical facilities.

● The United States recorded its 11th case of the coronavirus, with a couple from central California falling ill after the husband’s trip to China’s Hubei province at the epicenter of the outbreak.