A top Chinese health official warned on Sunday that the virus’s spread was accelerating despite a lockdown affecting 56 million people. The quarantine could make the situation worse, including by exacerbating shortages of medical supplies.

The details: Most of the nearly 3,000 people who have contracted the virus live in China, but it has spread to 10 other countries. Five cases have been confirmed in the U.S.

Go deeper: Compared with China’s response to the SARS epidemic in the early 2000s, the government has responded faster to the current outbreak. But there are signs that officials, especially those at the regional level, were slow to recognize the danger and are continuing to mishandle the crisis.

Related: Global markets tumbled today and oil prices fell, as the spread of the virus raised investor worries.

Another angle: Many airlines are accommodating travelers who want to modify, delay or cancel China itineraries. Here’s what to expect.