BEIJING (AP) — An outbreak of African swine fever in China could jump the border to neighboring countries in Southeast Asia or the Korean Peninsula, the U.N.'s Food and Agriculture Organization warned Tuesday.

Outbreaks of the highly contagious, viral disease that affects pigs and wild boar have been reported in four different Chinese provinces over the past month. The FAO said the distances between each outbreak — up to 1,000 kilometers (621 miles) — highlighted the danger of the virus spreading to other Asian countries at any time.

The "diverse geographical spread of the outbreaks in China h...