A timeline of Oregon’s novel coronavirus cases:

Feb. 28

A Washington County man tests positive for the coronavirus, becoming the first person in Oregon known to have contracted COVID-19.

Officials believe the man, who is between the ages of 40 and 50, picked up the virus as it circulated in the community. The man was put into isolation at Kaiser Permanente Westside Medical Center in Hillsboro and remained there as of March 7, according to the Oregon Health Authority. A Kaiser Permanente spokesman has declined to provide any information about the man’s current health condition.

He works at Forest Hills Elementary School in Lake Oswego, which closed for three school days to deep clean after test results became public.

March 1

Oregon’s second coronavirus patient is identified as a female relative of the first patient.

The Washington County woman, who is between the ages of 40 and 50, did not require medical attention and has been isolated at home.

March 2

A third person tests positive for coronavirus in Oregon.

The Umatilla County man had been hospitalized two days earlier after he attended a youth basketball game at the middle school in Weston. The man, who is between the ages of 60 and 70, was being treated at a hospital in Walla Walla, Washington. County officials have said doctors expect him to make a full recovery. Wildhorse Resort and Casino east of Pendleton, where he works, was closed two days for cleaning.

March 7

State health officials announce four additional presumptive positive COVID-19 cases.

Two of the cases are from Jackson County, one is from Klamath County and one is from Washington County. They also said three of the new cases are related to recent travel, while the Washington County case resulted from contact with a previously identified COVID-19 case.

The Washington County case is a person between the ages of 55 and 74 who did not need medical attention.

The two Jackson County patients are adults from the same household who are between the ages of 55 and 74. County officials said the pair traveled out of the country recently and have not been hospitalized.

The Klamath County case is a person between the ages of 55 and 74 who also recently traveled out of the U.S. County officials would not say whether the person is hospitalized or quarantined at home, only that the person is “secure from other people.”

March 8

Tests identify seven new coronavirus cases, doubling the state’s population of known COVID-19 patients. Five of the new cases are in Washington County, officials said. Douglas and Marion counties announced their first cases.

Health officials from all three counties withheld the age, sex and condition of the newly identified coronavirus patients. Douglas County officials said only that their county’s patient is “medically stable.” Three other patients were hospitalized at the time they were diagnosed, officials said.

Washington County officials said four of their county’s new cases are linked to the first coronavirus patient. The fifth case isn’t linked to any known case and is likely the result of the virus circulating in the community.

Health officials believe all seven new cases are the result of the virus spreading within the community or contact with another known case, not the result of international travel.

March 9

For the first time in three days, no new cases of the novel coronavirus are found.

Sixty-five more people tested negative for the virus that day.

March 10

Officials announce a person in Multnomah County has tested positive for the coronavirus, marking the first case of COVID-19 in the state’s most populous county.

The patient, between the ages of 55 and 74, is being treated at the Portland Veterans Affairs Medical Center, officials said.

CORONAVIRUS IN OREGON: THE LATEST NEWS

-- The Oregonian/OregonLive staff

Subscribe to our Oregon coronavirus newsletter: