DAVIS (CBS13) – UC Davis has apologized to a fraternity it accused of holding a potential COVID-19 superspreader event.

Last week, the school said it had launched an investigation into Theta Chi fraternity, alleging it threw a party after one of its members tested positive.

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Investigators were not able to find evidence to back up those claims. Chancellor Gary May apologized for causing “discomfort and embarrassment” to the fraternity.

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Earlier this year, University of California, Berkeley reported a spike in students testing positive for the COVID-19 and is attributing the increase in cases to a series of fraternity and sorority parties.

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UC Berkeley University Health Services Medical Director Anna Harte and Assistant Vice Chancellor Guy Nicolette revealed the sharp rise in coronavirus cases in a statement published on the UC Berkeley website.