Helsinki, Finland - A significant norovirus outbreak linked to contaminated oysters has affected over 30 individuals in Helsinki, the city announced in a press release on Thursday.

The outbreak prompted immediate action from health authorities, who conducted inspections at restaurants and collected food samples for analysis. While the official results are pending, patient specimens have strongly indicated norovirus as the culprit.

The investigation has focused on oysters supplied by several importers from the Netherlands, France, Spain, and Ireland. Oysters are filter feeders and can accumulate norovirus if they inhabit waters contaminated with human sewage. Unfortunately, restaurants lack the means to reliably detect norovirus in oysters, and brief heating may not effectively inactivate the virus.

Norovirus is highly contagious and easily spreads within families and close contacts. Symptoms typically include nausea, vomiting, and diarrhea, with an incubation period of 12-48 hours after consumption.

"Eating raw oysters always carries a risk, even though not all oysters are contaminated," emphasized Riikka Åberg, Director of the Food Safety Unit.

Key Points:

Outbreak: Over 30 cases of norovirus food poisoning reported in Helsinki.
Source: Suspected contaminated oysters from the Netherlands, France, Spain, and Ireland.
Risk: Oysters filter norovirus from contaminated water, and restaurants cannot easily detect or eliminate the virus.
Symptoms: Nausea, vomiting, diarrhea with an incubation period of 12-48 hours.
Contagious: Norovirus spreads easily among families and contacts.
Prevention: Thorough cooking (90°C for 2 minutes) is crucial to kill norovirus.
Further Investigation:

The Food Safety Unit is actively investigating the outbreak in collaboration with the City of Helsinki's Epidemiological operations. Authorities are urging individuals experiencing suspected food poisoning to report their cases.