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 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 20,438 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.

● The U.S. Department of Health and Human Services notified Congress on Sunday that it might need to transfer as much as $136 million to help combat the epidemic.

● 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.