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Dozens of people were infected with norovirus in a group outbreak after attending a wedding in Japan.
On June 24, Hokkaido Broadcasting reported that "among the 53 people who attended a wedding held on June 6, 27 experienced symptoms such as fever, and tests detected norovirus in their stool samples." Attendees of the wedding, which took place at a venue in Chuo Ward, Sapporo, began reporting feeling unwell on June 9. An investigation confirmed that the wedding was held on June 6, and that 27 out of 53 attendees experienced symptoms such as fever, vomiting, and diarrhea. Norovirus was detected in the stool samples of some of these individuals.
The patients included 27 men and women ranging from preschool children to people in their 50s, with 14 men and 13 women affected. Of these, 17 visited hospitals and are currently recovering. Five days before this wedding, on June 1, another wedding was held at the same venue, during which an infant brought by a guest defecated at the site. The Sapporo City Public Health Center determined that, during the cleaning process, disinfection was insufficient because ethanol?which is not effective against norovirus?was used, and this led to the food poisoning outbreak on June 6. As a result, the health center issued a three-day business suspension for the wedding venue, effective from June 24, under the Food Sanitation Act.
Previously, 80 people attended the June 1 wedding, and 40 of them reported symptoms such as fever, vomiting, and diarrhea. However, in that case, the source of infection was suspected to be something other than food, so it was not classified as food poisoning. The Sapporo City Public Health Center emphasized, "Ethanol disinfection is insufficient against norovirus; disinfection must be carried out with chlorine-based bleach or similar agents."
Norovirus is transmitted by consuming food or water (such as groundwater or shellfish) contaminated with the virus or through contact with infected individuals. After infection, symptoms such as vomiting and diarrhea typically appear within 12 to 48 hours following an incubation period. Depending on the individual, abdominal pain, chills, and fever may also occur. Most people recover within two to three days, but because immunity is short-lived, individuals who have previously contracted the virus can be reinfected.
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