China reported another fall in the new coronavirus infections outside of its epicenter on Sunday, but world health officials warned it was too early to make predictions about the outbreak as new infections and fears of contagion increased elsewhere.

China's health commission confirmed 648 new infections on Sunday — higher than a day earlier — but only 18 were outside of Hubei province, the lowest number outside of the epicenter since authorities started publishing data a month ago.

But new infections outside of China continued to worry world health authorities, with South Korea on Sunday reporting a fourth death due to the virus and 123 new cases, bringing its total to 556, having doubled from Friday to Saturday.