Person-to-Person Transmission During a Norovirus Outbreak in a Korean Kindergarten: A Retrospective Cohort Study
Abstract
Highlights A norovirus outbreak occurred at a kindergarten with 28 cases out of 114 children (24.6%). Sharing the same class or floor as the primary case was a significant risk factor in this retrospective cohort study. Isolation and restriction of symptomatic children should be strengthened, especially in kindergartens. What are the main findings? This study confirmed person-to-person transmission as the primary route in a kindergarten norovirus outbreak. The person-to-person transmission was identified through statistical analysis. What is the implication of the main finding? These findings suggest the need to systematically investigate norovirus outbreaks considering foodborne and person-to-person transmission. Abstract Objectives: Norovirus outbreaks occur in densely populated environments, such as long-term care facilities, hospitals, and schools. On 22 October 2022, an outbreak of acute gastroenteritis was reported at a kindergarten in Korea. An epidemiologic investigation was conducted to identify the source of the infection and prevent further spread. Methods: Rectal swab and environmental samples were collected for bacterial and viral testing. A retrospective cohort study was conducted among 114 kindergarteners at the kindergarten. Relative risks (RRs) and 95% confidence intervals (CIs) were calculated to assess associations of contact with the primary case, as well as food and water consumption. Results: Of the kindergarteners, 28 out of 114 (24.6%) met the case…
How strong is the evidence?
Evidence Hub reads this as a cohort study, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 114 participants or records.
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