Alliance for Pandemic Preparedness

October 29, 2020

COVID-19 Outbreak at an Overnight Summer School Retreat ― Wisconsin, July–August 2020

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  • Investigation of a SARS-CoV-2 outbreak associated with an overnight high-school retreat suggests a single introduction from a student subsequently infected 76% (116) of attendees. The suspected index case received a negative PCR result 1 week prior to the retreat but experienced symptoms shortly after arrival. The attack rate among susceptible attendees was 91% (116 of 128), excluding 24 attendees with positive serologic results prior to the retreat (none of whom received positive PCR results at the retreat). All illnesses were mild to moderate, with no hospitalizations or deaths.

Pray et al. (Oct 30, 2020). COVID-19 Outbreak at an Overnight Summer School Retreat ― Wisconsin, July–August 2020. MMWR. Morbidity and Mortality Weekly Report. https://doi.org/10.15585/mmwr.mm6943a4