China’s National Health Commission said the virus, which causes pneumonia, had spread to new cities and that some medical staff had been infected by patients, the country’s official Xinhua news agency said. The outbreak, which began in the central city of Wuhan, has now spread to other cities including the capital Beijing and Shanghai. Five new cases were confirmed in Beijing and 14 more in Guangdong province. A new case was reported in Shanghai. The number of cases has tripled to more than 220, and three people are known to have died. Cases have been reported in Thailand, South Korea and Japan, all involving people who had visited Wuhan. Adding to the difficulties of containing the virus, hundreds of millions of Chinese people will be travelling domestically and abroad during the Lunar New Year holiday that starts this week.