SALEM, Ore. (AP) — The Oregon Health Authority reported 382 new confirmed COVID-19 cases Thursday, the state’s highest daily case count since mid-July.

Officials also said 77 employees at a seafood processing plant on the Oregon Coast tested positive for coronavirus. The outbreak was tied to Labor Day social activities

Oregon’s confirmed COVID-19 case count, since the start of the pandemic, is now 31,865. The death toll is 539.

Nearly 25% of the cases reported Thursday were in Multnomah County, Oregon’s most populous county and home to Portland.

Last week the health authority said that data suggested that the rate of transmission is continuing in a downward trend, meaning that each case is generating less than one other case. If transmission continued at that rate then by early October new cases could decrease to 80 a day.

If there is a 5-percentage-point increase in transmission rates over the next month, the health authority predicts 400 new daily infections a day.

Officials say that it is unclear what effects the evacuations, due to recent wildfires in Oregon, and the poor air quality might have on COVID-19 transmission.