Table 1. Suspected and identified norovirus outbreaks, Finland, 1998–2003.
| Outbreak | Date | No. exposed/no. ill | Water source |
|---|---|---|---|
| E1, community* | Mar 1998 | 5,000/2,500 | Surface water used as tap water |
| E2, community | Apr 1998 | 15,000/2,000 | Ground water |
| E3, rental camp cottage | Jul 1998 | 45/13 | Well |
| E4, camp on island | Aug 1998 | 120/40 | Communal, well |
| E5, community | Jan 1999 | 2,500/200 | Ground water |
| E6, factory area | Feb 1999 | 250/100 | Ground water |
| E7, community | Apr 1999 | 160/58 | Ground water |
| E8, spa | Jul 1999 | 100/60 | Well |
| E9, community* | Mar 2000 | 10,000/5,500 | Ground water |
| E10, private household | Aug 2000 | 14/13 | Well (drilled) |
| E11, community | Dec 2000 | 2,200/300 | Ground water |
| E12, farm (for guests) | Apr 2002 | 50/25 | Well (dug) |
| E13, community | Oct 2002 | 960/300 | Ground water |
| E14, guest house | Feb 2003 | 13/11 | Lake water used for drinking |
| E15, community | May 2003 | 150/95 | Well (drilled) |
| E16, rental cottage | Aug 2003 | 25/20 | Well |
| E17, holiday camp | May 2003 | 56/40 | Surface water (river) |
| E18, community | Apr 2003 | 90/40 | Ground water, broken pipe |