Yersinia outbreak linked to imported iceberg lettuce

A scourge of Yersinia in Sweden has ended with iceberg lettuce because the suspected supply of an infection.

From January until the beginning place of February this 12 months, twice as many people fell unwell with Yersinia an infection as did all the tactic all through the the identical interval in a identical outdated 12 months.

From 53 instances of Yersinia enterocolitica, 33 lived in Stockholm, Västra Götaland and Halland. Isolates from 24 of those instances had been typed by total genome sequencing and 16 outbreak sufferers with clustered isolates of sequence kind 18 may nicely trustworthy be recognized.

Of these 16, eleven had been females and 5 had been males dilapidated 7 to 34 years worn. All fell unwell between Jan. 4 and 18.

Managing sources


Rikard Dryselius, a microbiologist at Folkhälsomyndigheten (Public Well being Company of Sweden), acknowledged sequence and typing of Yersinia isolates is no longer completed mechanically within the nation.

“In its place, specific particular person counties can ask for help with typing Yersinia after they uncover a few necessity. Alternatively, we would nicely trustworthy ask the laboratories to ship in isolates if we uncover about an amplify in instances nationally that have to be investigated,” he acknowledged.

“As a result of strained convey for an infection management units and scientific laboratories all the tactic all through the pandemic, we selected to ask interviews/questionnaire responses and sequence of isolates utterly from the counties the place the amplify was once high potential. It’s subsequently very seemingly that there private been higher than 16 outbreak instances nonetheless the dearth of further isolates to sequence implies that we are able to no longer verify this.”

Folkhälsomyndigheten, an infection management units within the Stockholm, Västra Götaland and Halland areas and Livsmedelsverket (Swedish Meals Company) investigated the incident.

Well being officers interviewed unwell of us and compiled questionnaire responses about what and the place they ate earlier than sickness onset.

A case-case witness the place questionnaire responses from outbreak instances had been in contrast with options from of us with Yersinia an infection that did no longer belong to the outbreak was once completed.

Restaurant and iceberg lettuce hyperlink


The investigators came across the outbreak instances had, to a elevated extent, visited a certain restaurant chain. Bear in mind-up interviews about what they’d eaten resulted in iceberg lettuce being suspected because the supply of an infection.

In response to the trawling questionnaire despatched to outbreak instances, seven out of 12 talked about they’d visited the restaurant chain earlier than falling unwell whereas seven out of 72 instances with yersiniosis who replied to the the identical questionnaire in 2019 talked about that they’d completed so.

The suspicion of a contaminated batch of iceberg lettuce disbursed to a restaurant chain was once strengthened by the outbreak timeline, which immediate {that a} product with an enormous geographical unfold and a restricted shelf existence was once the underlying set off.

Sweden has no very important manufacturing of iceberg lettuce in the meanwhile of 12 months and makes an attempt are being made to set the nation of beginning place.

In the interim, investigations are ongoing to go looking out the supply of a Salmonella Enteritidis outbreak within the nation. It’s no longer associated to the Salmonella outbreak in Norway linked to meat from Germany.

The primary particular person fell unwell on the stop of December 2020. There are 25 confirmed sufferers at some degree of 14 areas in southern and central Sweden.

Almost three quarters of sufferers are childhood youthful than 10 years of age and 4 are older than 70.

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