Iceberg lettuce is considered to be the most likely source of infection.
The number of salmonella cases in Jyväskylä has risen to almost 450. Fresh salads are becoming the cause of the infections, the city of Jyväskylä says.
A total of 442 absences due to stomach symptoms have been reported from the city’s early childhood education, private day care centers and Vertti day activities. There have been 377 children and 65 adults with symptoms.
According to the city, about 2,500 children have been present in early childhood education and Vertti activities every day and this week. As a result, about one in seven children, or 15 percent of those in kindergarten or Vert, became ill.
The city of Jyväskylä estimates that the epidemic that broke out just before Midsummer has been curbed. On Tuesday, only a few new cases of the disease came to the city’s attention.
The best way to prevent the spread of salmonella is to maintain good hand hygiene.
In kindergartens the first preliminary test results have been obtained from the meal materials provided. Salmonella has been found in vegetables served at kindergarten lunch less than two weeks ago. The sampling included foreign iceberg lettuce, domestic fresh cucumber and domestic frozen peas.
So far, there is no certainty as to where the fecal salmonella bacterium comes from. However, iceberg lettuce is considered to be the most likely cause of infection. The results of further studies are expected no earlier than Friday.
Iceberg lettuce has come to the central kitchen ready to use in bags. According to the city, the possible contamination of the salad has taken place either in primary production with irrigation water or in a state where the salad has been processed and bagged. The iceberg lettuce comes from Sweden.
For the time being, foreign iceberg lettuce is not used in food services.