アメリカで10日間におよぶ大規模イベント開催→関連するコロナ感染者260000という大規模クラスター発生

https://www.motherjones.com/coronavirus-updates/2020/09/sturgis-motorcycle-rally-is-now-linked-to-more-than-250000-coronavirus-cases/

SIOUX FALLS, S.D. – A study by a California research group estimates that the Sturgis motorcycle rally in South Dakota led to more than 260,000 coronavirus cases in the month following the event.

Researchers from the Center for Health Economics and Policy Studies at San Diego State University published their findings Saturday in a 63-page report.

The estimate is dramatically more than the number of cases tied to the rally reported by both the South Dakota health department and the Associated Press.

South Dakota Gov. Kristi Noem on Tuesday said the study was "fiction," and she criticized journalists who reported on it.

The goal of the study was to estimate the impacts of a single "super-spreader" event on the spread of COVID-19.
The same group has conducted similar studies on cases resulting from events like the nationwide Black Lives Matter rallies and the June political rally for President Donald Trump in Tulsa, Oklahoma.

Previously:First COVID-19 death linked to massive Sturgis biker rally; cases reported across the nation