The HSE says an outbreak of a gastroenteritis-type illness among teenagers in north Kerry was most likely caused by a virus.
A HSE Outbreak Control Team launched the investigation last week after numerous young people fell ill having attended discos in Listowel.
A representative of the HSE has told Radio Kerry gastrointestinal outbreak investigations are commonly undertaken.
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The investigation into this outbreak is now nearing completion, with the most likely cause being a viral infection involving person-to-person spread.
HSE South West Public Health says there is no further need for parents to contact them.
