Gov. Newsom: 28 positive coronavirus cases in California

A day after the first case of person-to-person coronavirus was reported in Solano County, California's governor on Thursday held a news conference on the state's response to the illness, known as COVID-19.

"We are not overreacting but we are not underreacting," Gavin Newsom said. "Yesterday's case generated a lot of attention, but we all knew this was inevitable." 

Newsom, California Health and Human Services Agency Secretary Dr. Mark Ghaly, California Department of Public Health Director and State Health Officer Dr. Sonia Angell and Director of the Governor’s Office of Emergency Services Mark Ghilarducci tried to allay concerns at the Health and Coordination Center at the California Department of Public Health in Sacramento. 

Newsom said state officials are in constant contact with the CDC and they are conducting "deep tracking and tracing" of patients. 

He added that 8,400 people who had arrived in California from flights that came from  "points of concern" are being monitored.

On Wednesday, the Centers for Disease Control and Prevention reported a coronavirus case in California, which could be the first in the U.S. that has no known connection to travel abroad or another known case, a possible sign the virus is spreading in a U.S. community, health officials said.  On Wednesday, President Trump also addressed the nation about the spread of the disease as well. 

Newsom said that in all there are only 28 cases of people who have tested positive for coronavirus in California. There had been 33, but five people had moved out of the state. 

Newsom said California is working "very collaboratively" with the Trump administration, pointing out that many repatriation flights of passengers have been taken in and cared for at Travis Air Force Base in Fairfield and other bases in the state. 

California officials said the person is a resident of Solano County, northeast of San Francisco, and is getting medical care in Sacramento County. They said they have begun the process of tracking down people who the patient has been in contact with, a process known as contact tracing.

The patient was brought to UC Davis Medical Center from another Northern California hospital on Feb. 19 but it was four days before the CDC heeded a request to test the patient for COVID-19, according to an email sent to employees Wednesday by the hospital’s interim CEO, Brad Simmons, and David Lubarsky, CEO of UC Davis Health.

Coronavirus case in Solano Co. treated at UC Davis center

The patient arrived on a ventilator and special protection orders were issued “because of an undiagnosed and suspected viral condition,” according to the email, which was sent to employees.

The hospital asked the CDC to test for the coronavirus but testing was delayed until Sunday “since the patient did not fit the existing CDC criteria for COVID-19,” the email said.

The hospital, which has treated other coronavirus patients, has been taking infection prevention precautions since the patient arrived. The email said officials believe there was only a small chance that others at the facility were exposed to the virus.

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“Nevertheless, a small number of medical center employees have been asked to stay home and monitor their temperatures,” the email said.

All of the 59 other cases in the U.S. had traveled from abroad or had been in close contact with those who traveled. Health officials have been on high alert for so-called community spread.

Earlier U.S. cases included 14 in people who traveled back from outbreak areas in China, or their spouses; three people who were evacuated from the central China city of Wuhan; and 42 American passengers on the Diamond Princess cruise ship who were evacuated by the federal government to the U.S. from where the ship was docked in Japan.

Some of those evacuated were taken to Travis Air Force Base, which is in Solano County. A number of the earlier cases have been in California, including among some of the people taken to Travis and one in which a traveler who returned to San Benito County spread it to a spouse.

A look inside a Bay Area hospital's isolation room for coronavirus

California officials have been preparing for the possibility that community spread of the virus might first surface there.

“We have been anticipating the potential for such a case in the U.S., and given our close familial, social and business relationships with China, it is not unexpected that the first case in the U.S. would be in California,” said Dr. Sonia Angell, Director of the California Department of Public Health and State Public Health Officer, in a statement.

The outbreak, which began in China, has infected tens of thousands of people in more than three dozen countries, with the vast majority in mainland China.

The new virus is a member of the coronavirus family that can cause colds or more serious illnesses such as SARS and MERS.

The virus can cause fever, coughing, wheezing, and pneumonia. Health officials think it spreads mainly from droplets when an infected person coughs or sneezes, similar to how the flu spreads.

Officials are advising people to take steps to avoid infection with coronavirus or other respiratory infections like a cold or the flu, including washing hands with soap and water and avoiding close contact with people who are sick.

The Associated Press contributed to this report. This story was reported from Oakland, Calif.