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Sweden reported 16 Salmonella Napoli illnesses, with interviews and purchase records pointing to arugula bought through the same supermarket chain and traced to Italy. The suspected batch was not tested because no product remained. Separately, meal deliveries in Uppsala have resumed after Listeria was found in seven containers of bean stew.
Sixteen people in Sweden fell ill in a Salmonella Napoli outbreak that authorities suspect was linked to arugula traced to Italy, according to a report published October 7. Interviews and purchase information connected most of the patients to arugula bought from the same supermarket chain, but investigators could not test the suspected batch because none of the product remained.
The Public Health Agency of Sweden said the patients were eight men and eight women, ranging in age from under 1 to 84. The median age was 57. Most reported illness onset dates fell between August 17 and September 6. Authorities noted a couple of later-onset cases that may have been secondary infections or may not have involved gastrointestinal symptoms.
Investigators interviewed 12 patients or received replies to questionnaires. Eleven said they had bought arugula from the same supermarket chain; the remaining person had bought a salad mix containing arugula there. The purchases took place within a relatively short period. The Swedish Food Agency then used a retained, empty package from one patient’s home to trace the product’s origin to Italy.
The agency could not sample the traced batch because no arugula from it was left. The investigation therefore supports a suspected connection, but it did not establish the presence of Salmonella in the product through testing. Salmonella Napoli is uncommon in Sweden: the report said eight cases were recorded in 2025.
Why the Arugula Link Matters
The investigation shows how purchase histories and product packaging can help public health officials connect illnesses to a food product even after it has been eaten or discarded. In this case, the empty package provided a traceability lead to Italy, while patients’ accounts pointed to a shared retailer and a narrow purchase period.
For consumers, the report identifies a suspected product link but does not name a specific brand, batch, or current recall. Because investigators had no remaining product to test, the evidence described is based on patient interviews and trace-back rather than a laboratory finding from the suspected arugula. The distinction matters: officials have identified a likely route for investigation, but the source was not confirmed by testing of the batch.
The reported count also gives authorities a defined group of cases to assess for links and possible secondary spread. The illness dates and the noted later-onset cases help explain why officials distinguish the main cluster from cases that may have resulted from person-to-person transmission or may not have had typical gastrointestinal symptoms.
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How Investigators Traced the Produce
The Swedish Public Health Agency reported the outbreak details, while the Swedish Food Agency conducted the product trace-back after receiving information from a patient who had kept an empty arugula bag for plastic recycling. That package led investigators to Italy as the product’s origin. The report does not specify the producer, exact distribution dates, or the supermarket chain’s name.
The case investigation relied in part on interviews and questionnaires. Of the 12 patients who provided information, 11 reported buying arugula from the same chain and one reported buying a salad mix containing it. These findings strengthened the suspected link, but the reported information does not say that every patient was interviewed or that all 16 had the same exposure.
The October 7 report also included a separate update from Uppsala, where home meal deliveries resumed after a Listeria finding at a municipal food supplier. A September 30 recall covered pre-packed meals supplied to about 400 home-care users as a precaution. Testing later found contamination limited to seven containers of bean stew; other tested samples from the kitchen and other dishes showed no Listeria, according to the report.
“The patients were eight men and eight women, ranging in age from less than 1 to 84, with a median age of 57.”
— Public Health Agency of Sweden
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What Testing Could Not Establish
Authorities did not test the suspected arugula batch because no product was left. The available account does not identify a producer, a lot number, a specific product brand, or whether any product from the same supply had already been removed from sale. It also does not report a recall tied to the suspected arugula.
The purchase information came from 12 of the 16 patients, and the report does not detail the exposures of the other four. It does not state how many of the cases were confirmed by laboratory testing, whether additional cases were being investigated, or whether the suspected source had been formally confirmed. Later-onset cases may have been secondary or may not have involved gastrointestinal symptoms, but their precise status was not provided.
The Uppsala Listeria update is a separate matter. The report says the risk of illness was considered very low and that no illnesses had been confirmed as linked to the incident. It does not describe the specific testing methods or provide further detail about the seven affected containers.
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Follow-Up on Both Food Incidents
The Salmonella report describes the trace-back findings but gives no further public timeline for the investigation. Authorities may use patient information and supply-chain records to assess whether other cases or products are connected; the source material does not say whether additional findings or a product notice are expected. Any confirmation of the suspected arugula link, or details identifying a supplier or batch, remains unreported.
In Uppsala, meal deliveries have resumed, and the municipality’s infection control unit said it would follow up with the supplier. The account does not provide a date for further results or describe additional corrective measures. The immediate confirmed status is that deliveries are operating again and the reported contamination was limited to seven bean stew containers.
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Key Questions
How many people became ill in the Salmonella outbreak?
Sixteen people were reported ill with Salmonella Napoli in Sweden. The patients were eight men and eight women, ranging from under 1 to 84 years old.
What food was suspected as the source?
Authorities suspected arugula, or a salad mix containing arugula, after most of the interviewed patients reported purchases from the same supermarket chain. A trace-back using an empty package led to Italy, but the suspected batch was unavailable for testing.
Was the Salmonella source confirmed by testing?
No. The report says investigators could not sample the suspected batch because no product remained. The evidence described points to a likely connection but does not confirm contamination through testing of that batch.
Is the Uppsala Listeria incident part of the Salmonella outbreak?
No. It was a separate food-safety incident involving meals supplied to home-care recipients in Uppsala. Testing found Listeria in seven containers of bean stew; meal deliveries have since resumed.
Were illnesses linked to the Uppsala meals confirmed?
The Uppsala infection control unit said there was no confirmed link to any illnesses and described the risk of anyone falling ill as very low.
Source: rss
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