Three European countries have recorded Listeria infections with fish being investigated as the source.
Germany has reported 30 infections and, since November, two people in Austria and one person in Denmark has contracted the same strain of listeriosis.
In Germany, patients were notified and transmitted to the Robert Koch Institute (RKI) from the end of September to mid-November. They are 38 to 93 years old and 26 people were hospitalized. One person died but a detailed cause of death was not reported.