The report warns that if the virus mutates in China, countries around the world will have little time to prepare for a deadlier version. In recent days, the United States, Japan, India, France and other countries have announced entry restrictions on travelers from China.

The report warns that if the virus mutates in China, countries around the world will have little time to prepare for a deadlier version. In recent days, the United States, Japan, India, France and other countries have announced entry restrictions on travelers from China.