Officials with the Norwegian Institute of Public Health report seeing an increase in listeriosis cases in December, prompting a warning for high-risk groups.
According to an official notice Friday (computer translated), six cases were reported this month when the country typically sees 1-2 cases a month.
Four of the six patients reported in December are from Hedmark and Oppland.
Health officials are working to identify if their is a common food source linked to the increase in cases.
FoodWorld 