The deadly coronavirus outbreak that has spread from China does not yet constitute a "pandemic", the World Health Organization (WHO) has said. A pandemic is the worldwide spread of a new disease, according to the WHO. At least 427 people have died with more than 20,000 confirmed cases around the world, most of them in China. More than two dozen nations have reported cases but, so far, no confirmations have been made across Africa or Latin America. On Tuesday, three more Asian countries - Singapore, Malaysia and Thailand - confirmed infections among citizens who had not travelled to China. Officials say 425 people have died in China and one in Hong Kong. One death has also been confirmed in the Philippines. The new coronavirus causes severe acute respiratory infection and symptoms usually start with a fever, followed by a dry cough. Among the main developments on Tuesday: Taiwan said that from Friday it would deny entry to all foreign nationals who have been to mainland China in the past 14 daysMacau - a special administrative region of China and one of Asia's biggest gambling hubs - announced that it would temporarily close down all its casinos. The UK government told all Britons in China to leave the country if they can. Many other nations are continuing to evacuate their citizens from affected areas of China. Health officials are screening about 3,700 people on board a cruise ship off Japan after a passenger tested positive for the virus.