More than 20 people are sick in Denmark as part of a Salmonella outbreak.
Since mid-May, the Statens Serum Institut (SSI) has recorded 25 cases of monophasic Salmonella Typhimurium.
Patients are 11 males and 14 females. Sick people are between 8 and 81 years old with a median age of 43.
Nine cases live in Hovedstaden, six in Nordjylland, five in Syddanmark, four in Sjælland, and one in Midtjylland.
SSI, the Danish Veterinary, Food, Agriculture and Fisheries Agency, and the National Food Institute are trying to find the source of the outbreak.
SSI is responsible for whole genome sequencing isolates from patients and patient interviews to help identify a possible source of infection.
Whole genome sequencing of bacteria isolated from patients shows they all belong to sequence type 34 and that they are very closely genetically related. This means there is likely to be a common source of infection.
Other Salmonella outbreaks
A different Salmonella outbreak has also been under investigation in Denmark since April.
In this incident, there are now 23 cases of the same type of Salmonella Enteritidis. Based on interviews, patients have been linked to a common school meal scheme at several sites in Sjælland.
The sick are 11 males and 12 females. Cases are mainly children aged 3 to 15, but there are also four adults aged 21 to 63. Patients primarily live in Hovedstaden but some are also in Sjælland.
SSI has interviewed patients or their parents and found that sick people received school meals from the same program at several different schools in Sjælland. Efforts are ongoing to find the source of infection.
As part of a separate multi-country Salmonella outbreak, Denmark has 10 cases.
Since January 2026, SSI has recorded people infected with the same type of Salmonella Stanley. There are nine males and one female. Patients are between 5 and 22 years old.
Across Europe, 83 confirmed cases have symptom onset between December 2025 and mid-May 2026. At least 20 people have been hospitalized. Patients have also been identified in Austria, Czech Republic, Estonia, France, Germany, Lithuania, Netherlands, and the United Kingdom.
Several sick people have eaten instant noodles of one brand. However, not all cases can be explained by this product. Salmonella Stanley was detected in an instant noodle meal from Ukraine via Poland. In Germany, Reeva Instant Noodle Dish Chicken Flavor 60 grams was recalled. The affected lot is L0126 with an expiry date of April 5, 2027.
The European Centre for Disease Prevention and Control (ECDC) is working on an assessment of the outbreak that it says is linked to chicken products. It is expected to be released in early July.