China Reports 4 More Cases in Viral Pneumonia Outbreak

Pedestrians wear protective masks as they walk through a shopping district in Tokyo on Jan. 16, 2020. Japan's government said a man treated for pneumonia after returning from China has tested positive for the new coronavirus identified as a possible cause of an outbreak in the Chinese city of Wuhan. Eugene Hoshiko/AP

BEIJING—Four more cases have been identified in a viral pneumonia outbreak in the central Chinese city of Wuhan that has killed two people and prompted countries as far away as the United States to take precautionary measures.

The cause of the pneumonia has been traced to a new type of coronavirus.