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Authors
Lund, Hilde Marie https://orcid.org/0009-0009-3290-4470
Brandal, Lin T. https://orcid.org/0000-0003-2514-7933
Ødeskaug, Liz Ertzeid https://orcid.org/0009-0002-5336-9015
Lange, Heidi
Katsiouleri, Polina
Johannessen, Gro S. https://orcid.org/0000-0001-8203-2361
Bergsjø, Bjarne https://orcid.org/0009-0003-3318-5793
Sangolt, Åsne
Dryselius, Rikard
Karamehmedovic, Nadja
Kuronen, Henry https://orcid.org/0009-0006-3926-9762
Vainio, Anni https://orcid.org/0009-0009-3276-9192
Rimhanen-Finne, Ruska https://orcid.org/0000-0003-2867-7921
Naseer, Umaer https://orcid.org/0000-0002-1639-8397
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Funding
Funding for this research was provided by:
Norwegian Institute of Public Health
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Article History
Received: 5 September 2025
Accepted: 22 January 2026
First Online: 5 February 2026
Declarations
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: Outbreak investigations are covered by national legislation thus ethical approval was not required. Informed consent was obtained from all cases prior to theinterviews.
: Informed consent to participate in the study was obtained from all cases prior to the interviews.
: As all presented case data are aggregated, consent from cases to publish was not required.
: The authors declare no competing interests.
