Sweden’s Public Health Agency has declared a specific outbreak of Listeria during the final three months of 2013, with 41 sickened compared to 25 for the same period the year before.

“There was a clear increase, which led us to suspect that this was an outbreak and therefore we decided to investigate the matter immediately, says Viktor Dahl with the Public Health Agency.

While previous Listeria outbreaks have largely been linked to smoked or pickled salmon, investigators suspect cold cuts in the latest increase.