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A Riverside County health official reported Monday that a 13th positive case of the coronavirus has been discovered from the Coachella Valley, bringing the total number of cases in Riverside County to 15.

Jose Arballo Jr., senior public information specialist from the Department of Public Health, said the source is under investigation.

The inadequate availability of testing supplies continues to limit whom the county will test. Misty Plumley, a medical health operational area coordinator with Riverside County, said the county is hoping that within seven days, the number of tests being manufactured weekly will increase from 1 million to 4 million.

On a briefing call with local business leaders Monday, she said that two sites in the western part of the Coachella Valley and at least one in Indio are being planned to come online as a "screening hub." However, patients will still require a physician's referral to obtain a test.

“We don’t have the testing capacity just yet to sustain that type of operation, so we’re sorting through the most critical needs first," Plumley said about the potential for a drive-through clinic. "The limitation is really on manufacturing and distribution.”

She also said that people have walked into hospitals "saying they have coronavirus, and they do not."

County staff also fielded questions from concerned business owners and members of local chambers of commerce about the already-present economic impacts.

When asked about support such as new grants for laid-off hospitality workers or independent contractors that would go beyond standard unemployment benefits, Plumley said localities are still waiting on word from the federal government. “Unfortunately, we don't have much in the way of tangible resources immediately available," she said.

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What we know about previous Riverside County cases

Here's what we know about the 14 cases reported before Monday:

Saturday, March 14: Two Coachella Valley residents are reported as testing positive for coronavirus. One of the patients was hospitalized and the other was in isolation at home. A county health official said the cases were not associated with community spread.

Friday, March 13: Riverside County health officials announced four cases in the Coachella Valley. One person had spent several days in the Rancho Mirage Health and Rehabilitation Center before being transferred to the hospital.

Thursday, March 12: One case is announced in the Coachella Valley.

Wednesday, March 11: One case is announced. The disease was locally acquired and the patient was isolated at home in the Coachella Valley, according a county health official.

Monday, March 9: Officials announced three positive cases in the Coachella Valley. Health investigators said the three infections were the result of contact with a known case or travel into areas where the coronavirus has been detected, according to Riverside County health officials. Two of the people were isolated at home and the third was being cared for at a local hospital.

Monday, March 9: Health officials also announced that a second Riverside County resident tested positive for coronavirus on a cruise ship. A county official said the patient was a passenger on a Diamond Princess cruise ship and was being treated in Northern California.

Saturday, March 7: Officials announced the county's first case of locally acquired coronavirus. That patient was undergoing care at Eisenhower Health in Rancho Mirage. Health officials declined to disclose details about the patient, including how and when the virus was contracted. A county public health official said on March 8 that officials were still investigating the source of contraction, which they hoped to complete in a couple of days but said it may be a case of "community spread." The patient has no connection to schools in Riverside County, Kaiser said.

Tuesday, Feb. 25: The first Riverside County resident to be diagnosed with the coronavirus is reported. The person was also a passenger on the Diamond Princess cruise ship in Japan and is being treated at a Northern California facility.

First case reported in San Bernardino County

San Bernardino County on Sunday announced its first confirmed case of the coronavirus. The patient, 53, went to Kaiser Fontana on Thursday after she became symptomatic and was tested for the virus.

"Our department is identifying who they had contact with so we can monitor any signs and symptoms," Lana Culp, spokesperson for the San Bernardino County Department of Public Health, told The Desert Sun.