The Statens Serum Institut is currently investigating a protracted disease outbreak with Listeria monocytogenes in collaboration with the Danish Veterinary and Food Administration and the Norwegian Food Institute DTU
A total of 17 people have been infected with the same type of listeria since the summer of 2019 (figure 1). The patients are 13 women and 4 men with a median age of 73 years, with one patient in their 20s and four in their 80s. The patients live throughout the country (table 1). All have been hospitalized. Two people have died within 30 days of detection of the infection.
The outbreaks are handled by the Central Outbreak Group, which consists of SSI, the Danish Veterinary and Food Administration and the DTU Food Institute. SSI stands for whole-genome sequencing of patients’ listeria isolates and interviews with patients or relatives with a view to identifying a possible source of infection. Since there are also people abroad who have become ill with listeria sequence type 1607, the international authorities are working on an international overview.





