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On Friday, authorities announced that two new locations in the district have been affected. The strain has been identified as H5N8, which is dangerous to birds but is not thought to pose a threat to humans.

The virus was initially discovered on four farms, which collectively contained 40,000 turkeys and 13,000 guinea fowl. The two new locations discovered on  January 3 are thought to be small scale chicken farms, with a smaller risk of further transmission.

Local officials reported that some 25,000 birds have already died at the original outbreak locations, and there are plans to liquidate a further 70,000 within the next few days to prevent further contamination, Polish Radio says.