Since March 2023, the Statens Serum Institut has registered 30 cases of Salmonella Muenchen. The Statens Serum Institut, the Danish Veterinary and Food Administration and the Norwegian Food Institute DTU are investigating the disease outbreak.
About the disease outbreak
From March to June 2023, 30 people infected with the same type of Salmonella were registered at the Statens Serum Institut (figure 1). Among the sick are 12 men and 18 women. The patients are between 10-95 years old (median age is 72 years). The patients live throughout the country (table 1).
Table 1. Patients with the same type of Salmonella in Denmark, mid-March to and including May 2023, per region (n=30)
| Region | Number of patients |
| The capital | 16 |
| Central Jutland | 6 |
| Northern Jutland | 2 |
| Zealand | 5 |
| Southern Denmark | 1 |
| Total | 30 |
The investigation of the outbreak
The outbreak is 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 isolates from the patients and interviews with patients or relatives with a view to identifying a possible source of infection.
The outbreak strain
The bacteria is of the type Salmonella Muenchen. When whole-genome sequencing of the bacteria that were isolated from the patients, it was seen that they were very closely related and all belonged to sequence type 82.
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