1. Health Service Executive (HSE) - Health Protection Surveillance Centre (HPSC), Dublin, Ireland
2. European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
3. National Virus Reference Laboratory (NVRL), University College Dublin, Dublin, Ireland
4. Food Safety Authority of Ireland (FSAI), Dublin, Ireland
5. Department of Public Health, HSE East, Dublin, Ireland
6. Environmental Health Service, HSE Dublin Mid-Leinster Region, Dublin, Ireland
7. Department of Public Health, HSE South, Cork, Ireland
8. Department of Public Health, HSE South-East, Kilkenny, Ireland
9. Department of Public Health, HSE West, Galway, Ireland
10. Department of Public Health, HSE North-East, Meath, Ireland
11. The members of the Outbreak Control Team are listed at the end of the article