Most of the new cases are young people between the ages of 15 and 25, said the release. The party is believed to have taken place between July 2 and 3.
Spread from the party has impacted people outside the county and even the Midwestern state, according to the release.
Health officials are now asking anyone who attended the party to self quarantine and monitor themselves for symptoms of the virus for 14 days.
There were an additional 66 people who are believed to have had face-to-face contact with a confirmed case. That number does not include family members who are immediate household contacts of the newly identified cases, the release said.
"This is a very clear example of how quickly this virus spreads and how many people can be impacted in a very short amount of time" Jimena Loveluck, Health Officer with Washtenaw County Health Department, said in the release. "We cannot hope to accomplish our goal of containing COVID-19 and preventing additional cases, hospitalizations and deaths without full community support and cooperation."
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