Spanish ASF outbreak may be linked to lab leak

Investigations into the cause of recent African swine fever (ASF) outbreaks in Spain’s wild boar suggest a research lab is a possible source of the virus.

December 8, 2025

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Investigations into the cause of recent African swine fever (ASF) outbreaks in Spain’s wild boar suggest a research lab is a possible source of the virus.

After an absence of over 30 years, the ASF virus was detected in wild boar in Spain at the end of November. The infected animals were found dead less than 2 kilometers apart in Barcelona province in the northeastern region of Catalonia.

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