New cases in the past seven days have accounted for 19% of all coronavirus cases in Oregon.
U.S. tops 2.27 million cases, leading the world in the outbreak.
Orange County reported its highest one-day total of new coronavirus cases for the second day in a row Sunday.
The seven-day average of new cases also rose, hitting its highest level since the coronavirus pandemic and COVID-19 arrived locally in March.
“When you have 20,000-plus infections per day, how can you talk about a second wave?" said Dr. Anthony Fauci of the National Institutes of Health.
An Italian infectious disease specialist said coronavirus was losing its strength and may die out before a vaccine is developed, but fellow epidemiologists disagree.
The new cases account for 4.6% of the 6,051 tests that came back positive Sunday.
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The Spokane Regional Health District reported 144 new cases of the virus detected for the week ending Sunday. That's up from 94 the week prior.
The Wisconsin Department of Health Services reported no new deaths from the coronavirus on Sunday.