Since September last year, 12 people have died of Listeria and a further eight have been infected after consuming ‘rullepølse’ sandwich meat.

The food product authorities Fødevarestyrelsen suspect that the bad meat originated from Jørn A Rullepølser in Hedehusene near Copenhagen and have closed down the producer.

The 20 infected patients consist of eleven women and nine men all aged 43-89 and all hailing from various parts of Denmark, according to the national serum institute Statens Seruminstitut.

“From September 2013 until today, 20 patients have been registered suffering from listeriosis, which is an aspect of the outbreak,” Statens Seruminstitut wrote in a press release.

“Most cases have however occurred recently. In June, July, and August, 15 cases have been registered alone.”

Similar to previous cases, the 12 people who died also suffered from other serious illnesses and their deaths cannot completely be attributed to a listeria infection, Statens Seruminstitut stated.