BARCELONA: African swine fever has been detected outside a containment zone in Spain’s northeastern Catalonia region for the first time since its outbreak in November, officials said on Friday.

African swine fever is a viral disease that is harmless to humans but nearly always fatal for pigs and wild boars.

Although it has not spread to domestic pig farms, the outbreak has disrupted exports from Spain, the world’s third-largest producer of pork and its derivatives.

Thirteen new cases in wild boars have been reported, including two in areas outside the six-kilometer containment zone near Barcelona, Catalonia’s agriculture department said.

Authorities then expanded the high-risk zone to the affected municipalities and restricted access to the surrounding woods to prevent further spread.