The California coronavirus patient whose case is of “unknown” origin was hospitalized for days without being tested, according to a new report.

The Solano County resident was admitted to UC Davis Medical Center last week but wasn’t tested until Sunday — and results came back positive Wednesday, CNN reported, citing a letter sent to hospital staff.

The patient was admitted to the medical center from another Northern California hospital Feb. 19 with a suspected viral infection, the letter said.

UC Davis requested that the CDC test the person for novel coronavirus because neither the Sacramento County nor the California Department of Public Health were conducting testing, according to the letter.

“Since the patient did not fit the existing CDC criteria for COVID-19, a test was not immediately administered,” said the letter, obtained by CNN. “UC Davis Health does not control the testing process.”

The CDC ordered that the patient be tested Sunday — four days after being admitted to UC Davis, according to the report. It wasn’t until three days later that the results came back positive.

“This is not the first COVID-19 patient we have treated, and because of the precautions we have had in place since this patient’s arrival, we believe there has been minimal potential for exposure here at UC Davis Medical Center,” said the letter.

The letter also asked a small number of UC Davis employees to stay home and keep an eye on their temperature.

The CDC said Wednesday that the infected patient did not have “relevant travel history” or come into contact with anyone known to be infected with the virus.

The case “could be an instance of community spread of COVID-19, which would be the first time this has happened in the United States,” the agency said.

On its website, the CDC said that the virus is “NOT currently spreading in the community in the United States.”

However, that spread is bound to happen, officials have said.

“It’s not so much a question of if this will happen anymore, but rather more a question of exactly when this will happen and how many people in this country will have severe illness,” Dr. Nancy Messonnier, director of the CDC’s National Center for Immunization and Respiratory Diseases, told the network. “We are asking the American public to work with us to prepare in the expectation that this could be bad.”

Health officials on Wednesday said three new cases of COVID-19 have been confirmed in the US, bringing the total number of cases to 60 — the vast majority of them being people evacuated from the infected Diamond Princess cruise ship in Japan.

But President Trump said that “the risk to the American people remains very low.”

Globally, COVID-19 has been responsible for at least 2,800 deaths.

More than 82,000 cases have been reported worldwide, in every continent except Antarctica.