A salmonella outbreak in Denmark has sickened more than 20 people.
Since mid-May, the State Serum Institute (SSI) has recorded 25 cases of monophasic Salmonella Typhimurium.
The patients were 11 men and 14 women. Sick people range in age from 8 to 81 years old, with an average age of 43 years.
Nine cases live in the capital, six in North Jutland, five in southern Denmark, four in Zealand and one in Central Jutland.
SSI, the Danish Veterinary, Food, Agriculture and Fisheries Agency and the National Food Research Institute are trying to find the cause of the outbreak.
SSI is responsible for analyzing whole genome sequences of isolates from patients and patient interviews to help identify possible sources of infection.
Whole genome sequencing of bacteria isolated from patients shows that they all belong to sequence type 34 and are genetically very closely related. This means there is likely a common source of infection.
Other salmonella outbreaks
Another salmonella outbreak has been under investigation in Denmark since April.
There are now 23 cases of the same type of Salmonella Enteritidis in this incident. According to the interviews, patients were connected to a common school feeding scheme at several sites in Sjælland.
The patients were 11 men and 12 women. The cases are primarily children ages 3 to 15, but there are also four adults ages 21 to 63. Patients mainly live in Hovedstaden, but some also live in Sjælland.
SSI interviewed patients and their parents and discovered that sick people were receiving school meals through the same program at several other schools in Sjælland. Efforts to find the source of infection are continuing.
There are 10 cases in Denmark as part of a separate multi-country salmonella outbreak.
Since January 2026, SSI has been recording people infected with the same type of Salmonella Stanley. There are 9 men and 1 woman. Patients range in age from 5 to 22 years.
Across Europe, 83 confirmed cases developed symptoms between December 2025 and mid-May 2026. At least 20 people have been hospitalized. Cases have also been confirmed in Austria, the Czech Republic, Estonia, France, Germany, Lithuania, the Netherlands and the United Kingdom.
Several sick people ate one brand of ramen. However, this product cannot account for all cases. Salmonella Stanley was detected in instant noodles that came from Ukraine via Poland. Reeva Instant Noodle Dish Chicken Flavor 60g has been recalled in Germany. The lot is L0126 and has an expiration date of April 5, 2027.
The European Center for Disease Prevention and Control (ECDC) is assessing the outbreak linked to chicken products. It is expected to be released in early July.
