Oregon's first case of coronavirus was diagnosed February 28.
The new face covering guidance requires masks in public and private office building hallways, bathrooms, elevators, lobbies, break rooms, and other common spaces, unless employees are at individual work spaces or in meeting rooms where six feet of distance from other people can be maintained. Health officials during the past two weeks have said these mandates have helped to slow the spread.
A 52-year-old woman died August 14 at Providence Portland Medical Center, marking the state's 388th COVID-19 death. Hospitalizations have also plateaued.
But not everywhere in the state is seeing cases plateau. She had underlying conditions and tested positive August 5.
"Seeing this decline is a sign that the spread (of COVID-19) may be slowing", said Patrick Allen, director of the Oregon Health Authority.
Over the past two weeks, Malheur County, which borders Idaho in southeast OR, has had a test positivity rate of 26%.
Gov. Kate Brown on Thursday announced that Malheur County would be downgraded from phase 2 to phase 1 under the state's economic reopening guidelines, starting Monday.
"Over the past month, COVID-19 cases in Malheur County have risen so much that restrictions must be put back in place or we risk further illnesses and death in the region", said Brown.
The county will remain in Phase 1 - where recreational sports, swimming pools, venues like movie theaters and arcades are closed - for at least 21 days.
Where the new cases are by county: Clackamas (26), Clatsop (1), Columbia (4), Deschutes (4), Hood River (2), Jackson (18), Jefferson (3), Josephine ( 1), Klamath (2), Lane (4), Lincoln (1), Linn (5), Malheur (12), Marion (40), Morrow (7), Multnomah (67), Polk (7), Umatilla (15), Wasco (1), Washington (29) and Yamhill (3).
The total new cases reported in the state was 323 on Friday. She tested positive August 12 and is Oregon's 387th COVID-19 death.
Also on Friday, the Oregon Health Authority epidemiologists released a study that indicates that the number of Oregonians who have been infected with the coronavirus may be 10 times higher than the reported rate of infections obtained through conventional testing.
In 897 blood samples from Oregonians without a coronavirus diagnosis, COVID-19 antibodies were found in nine of them, according to a study co-authored by Dr. Paul Cieslak, medical director of the state's infectious disease and vaccination program.
The higher rate would put Oregon's estimated COVID-19 tally at about 107,500 cases, more than four times the amount of confirmed and presumptive cases OR health officials have reported.
"The major takeaway of the results of the (blood sample) survey is the vast majority of us in OR still remain unaffected and susceptible to the disease", he said.