The study found a fatality rate of 2.3 percent in China as of last week, though later figures suggest the rate has increased. In the U.S., flu fatality rates hover around 0.1 percent. Here are the latest updates and maps of where the virus has spread.

Yesterday: Americans flown home from a contaminated cruise ship in Japan said they were unaware until late that some evacuees were infected. “I didn’t know until we were in the air,” said Carol Montgomery. “I saw an area of plastic sheeting and tape.”

Closer look: Cambodia’s decision to let hundreds of passengers leave another cruise ship on which a person was infected could dramatically complicate the effort to contain the virus.

Another angle: HSBC, one of Hong Kong’s most important banks, said today that it would cut 35,000 jobs over the next three years, in part because of disruptions caused by the outbreak. On Monday, Apple cut its quarterly sales expectations and warned that the virus threatened global supply chains.

Related: The Tokyo Marathon, which planned to accept about 38,000 runners, will be restricted to about 200 elite participants. The race is scheduled for March 1.