Note: The numbers on this page are no longer up to date. Track the latest statewide and local totals using our California coronavirus tracker.
Cases of the coronavirus have begun to mount in the United States and are expected to continue to grow in the coming weeks as the virus spreads and testing increases.
“We are facing a historic public health challenge,” said Dr. Nancy Messonnier, director of the Centers for Disease Control and Prevention’s National Center for Immunization and Respiratory Diseases. “We will continue to respond to COVID-19 in an aggressive way to contain and blunt the threat of this virus. While we still hope for the best, we continue to prepare for this virus to become widespread in the United States.”
In California, at least 198 cases have been reported, including four deaths — the most recent of which was announced Wednesday. Gov. Gavin Newsom has declared a state of emergency in response to the outbreak. On Wednesday, the World Health Organization officially referred to the coronavirus as a pandemic for the first time.
About 24 of the cases in California have been people who caught the virus either on the Diamond Princess cruise ship off Japan or in Wuhan, China, where the outbreak was first reported, and were then repatriated to the U.S. and quarantined at California military bases. The others were returning travelers or, in at least 10 instances, people who contracted the virus in their communities.
A growing number of cases are tied to another Princess Cruises ship, the Grand Princess, which departed San Francisco on Feb. 11 and sailed to Mexico before returning Feb. 21, dropping off some passengers and then departing for another voyage to Hawaii. The ship docked at the Port of Oakland Monday and began the painstaking process of unloading passengers.
Newsom previously said most of the 962 California residents aboard the ship who did not need immediate medical attention would be taken to Travis Air Force Base for 14 days of quarantine, with a smaller number going to the Marine Corps Air Station Miramar in San Diego County. Up to two dozen passengers will be taken to the Asilomar State Beach and Conference Grounds in Pacific Grove for their quarantine period.
Here is a geographical rundown of the California cases:
Four cases have been reported so far. The first was a healthcare worker at NorthBay VacaValley Hospital whose diagnosis was announced March 1. The worker came into contact with a Solano County woman who was treated at the hospital before she was transferred to UC Davis Medical Center and diagnosed with COVID-19. The healthcare worker was isolated at home.
The second case, involving a person in Berkeley who visited a country experiencing an outbreak, was reported March 3. That individual has remained at home in a self-imposed quarantine since returning.
The third, reported by the county’s health agency Friday, is an older adult who has underlying medical conditions and was a passenger on the Grand Princess cruise ship from Feb. 11 to Feb. 22.
Most recently, the city of Alameda confirmed Wednesday that a firefighter had tested positive for the virus.
The county has declared a local emergency.
Contra Costa County
Contra Costa County has reported 16 cases. The first person, who had no known history of travel to a high-risk area or contact with another confirmed case, tested positive March 3, officials said. The test was performed by the county’s public health lab. The patient was being treated at a hospital.
On Friday, officials announced three more patients. Two were passengers on the Grand Princess cruise ship. The third person had close contact with a person who was diagnosed with the coronavirus in another jurisdiction, county health officials said. All three people were being isolated at their homes.
The county is now recommending that adults older than 50 and people with underlying medical conditions that could put them at risk of contracting COVID-19 avoid mass gatherings like parades, sporting events or concerts.
Contra Costa County announced five new cases on Sunday, four of which had no known history of travel outside the U.S. or contact with a confirmed case. The four residents were hospitalized, Contra Costa Health Services said in a news release.
The fifth person had close contact with another person who tested positive for COVID-19 and is isolating at home, officials said.
Officials confirmed the county’s 10th case Tuesday.
The county on Saturday confirmed its first case of the new coronavirus, a person who returned from a voyage on the Grand Princess cruise ship on March 6. The person’s family was self-monitoring under the oversight of the Fresno County Department of Public Health, officials said.
Authorities announced Feb. 19 that a Humboldt County resident who had recently traveled to China had been diagnosed with the coronavirus. The patient, who was voluntarily quarantined at home, has since been cleared and released, officials said.
Los Angeles County
There have been 32 confirmed cases and one death — a woman older than 60 who had been visiting the county after extensive travel, including a long layover in South Korea.
Officials said Wednesday that the woman had underlying health issues and died shortly after being hospitalized.
The county’s first patient was a Wuhan resident who was flying through L.A. on Jan. 22 on his way back to China and sought care at Los Angeles International Airport, health officials announced Jan. 26.
The patient was taken directly to a hospital, quarantined for 14 days and released, said L.A. County public health director Barbara Ferrer. More than 50 people who came into contact with the patient, many of whom were health workers, were identified as at risk and were asked to limit contact with others, Ferrer said.
Health officials on March 4 confirmed six additional patients, all of whom they said were exposed to the virus through close contact with others who were infected.
Half of the new cases were travelers who had visited northern Italy, two were family members who had close contact with a person outside of the county who was infected, and the other had a job that put them in contact with travelers, officials said. That person works as a screener at Los Angeles International Airport, according to a source familiar with the case.
L.A. County and city officials declared a state of emergency March 4 in response to the growing case counts.
The next day, officials announced that four more travelers in that same group who visited northern Italy had also tested positive for the virus.
On Friday, officials announced two additional cases — another person in the group of travelers who visited northern Italy, as well as another screener at LAX. Their close contacts were being self-quarantined.
On Saturday, one new case was identified as a resident who had returned from the American Israel Public Affairs Committee conference in Washington, D.C., where there was known exposure to a person infected with the virus.
The county announced two new cases Monday, including its first instance of possible community spread. Both patients are in isolation, and all close contacts are or will be quarantined for 14 days, health officials said.
Officials confirmed another new case Tuesday — a resident who had flown into LAX from Iran and was taken to a medical facility — and six additional cases Wednesday.
Ferrer said that one of the new cases included the county’s second instance of community spread. That individual is hospitalized. Three individuals, one of whom is currently hospitalized, are household contacts of an L.A. County resident previously confirmed to have the virus. One individual had traveled to France and returned home ill and another had traveled to a religious conference in a different state.
On Thursday, L.A. County officials reported three additional cases, two of which had an unidentified source of exposure to the virus. The third was a person who was exposed to the coronavirus by a person who tested positive after attending a conference in Washington, officials said. Out of the three, one person was hospitalized.
Long Beach, which has its own health department, reported its first three cases Monday after preliminary test results indicated two men and one woman had contracted the disease and then a fourth case Wednesday, city officials said.
Elsewhere in the county, a Beverly Hills priest was disagnosed with the coronavirus Wednesday after returning from a trip to St. Louis days prior. In a statement, she told her church members she was “very much on the mend” and had already been through the worst of it.
Public health officials announced the county’s first case on Saturday, a person who recently had returned from a Princess Cruises cruise and was in stable condition.
The state Department of Public Health contacted county health officials on March 5 to begin monitoring a husband and wife who had recently returned from the cruise. The couple was isolated in their home, the Madera County Department of Public Health said in a news release.
When one of them developed symptoms, the county worked with Madera Community Hospital to coordinate their medical care and testing. Masked hospital staffers met them at their car and led them directly to an isolation room; at no time did they enter public areas, officials said.
The couple received one visitor at their home before reporting symptoms, and that person is being monitored by communicable disease staff, officials said.
Officials are investigating six cases in Orange County . Public health officials announced Jan. 25 that a returning traveler from Wuhan had tested positive for the virus. The patient was isolated in a hospital and since recovered, officials said.
Officials confirmed two additional cases on March 3: One was a man in his 60s and the other a woman in her 30s. Both had visited countries with widespread transmission, officials said.
On Feb. 26, Orange County declared a local health emergency in response to the coronavirus.
The county has announced a total of seven cases.
An elderly adult who had tested positive for COVID-19 after returning from a cruise became the first person to die from the virus in California, Placer County Public Health officials announced March 4.
That individual, who officials said had underlying health conditions, was the county’s second confirmed coronavirus patient and had been placed in isolation at Kaiser Permanente Roseville.
Officials said the patient who died was probably exposed during a trip on the Princess Cruises ship that departed Feb. 11 from San Francisco and sailed to Mexico, returning Feb. 21.
A healthcare worker in Placer County was confirmed on March 2 as a presumptive coronavirus case, pending confirmation from the CDC.
The individual, now in isolation at home, is a NorthBay VacaValley Hospital worker who came into close contact with a previously confirmed case in Solano County, before that patient was transferred to another hospital and tested for the virus.
On Friday, Placer County announced three more cases, all of them among people who had traveled on the Grand Princess cruise ship from San Francisco to Mexico.
Two of the people had mild symptoms that already resolved, while the third continued to experience mild symptoms, the Placer County Public Health Department said in a news release. None of them required hospitalization, and all three were isolated at home, officials said.
The department was working on tracing the people’s contacts to identify more possible cases, officials said.
There were seven confirmed cases as of Tuesday, according to the department.
Officials have reported eight coronavirus cases in Riverside County.
The county on Saturday announced its first “locally acquired” case of the virus, a person who was being treated at Eisenhower Health in Rancho Mirage, Riverside University Health System-Public Health said in a statement. Public health officials were still investigating how the person caught the virus, and were working to contact other people who might have been exposed.
Riverside County’s public health officer, Dr. Cameron Kaiser, declared a local and public health emergency on Saturday.
Another Riverside County resident who was evacuated from the Diamond Princess cruise ship off Japan and then quarantined at Travis Air Force Base was one of the 20-plus people there who previously tested positive for the virus. That person is continuing to recover in a Northern California hospital and has not returned to Riverside County since leaving the cruise ship, the statement said.
On Monday, county health officials announced three new cases in the Coachella Valley. Two of those individuals were isolated at home and the other went to a local hospital.
Investigators believe those infections were the result of either travel into areas where the coronavirus has been confirmed, or contact with another patient.
Ten cases have been confirmed in Sacramento County.
A Sacramento County resident who returned to the U.S. from China on Feb. 2 was found to have the virus, officials announced Feb. 21.
The person took precautionary measures during travel and was asymptomatic but had self-quarantined since returning, according to the county public health department.
Last week, Sacramento County announced two more cases, and on March 5, it declared a local and health emergency.
As of Monday, the county had 10 confirmed cases, including one person who has recovered. Among those who tested positive was an elementary-school-aged student in Elk Grove.
Health officials on Tuesday confirmed the county’s first fatality from COVID-19 — a patient in her 90s. The woman was among about 140 patients at an assisted-living facility in Elk Grove.
San Benito County
Two cases were reported in San Benito County on Feb. 2. A man, 57, who had recently returned from Wuhan became ill and passed the virus on to his wife, also 57. Officials said the couple had not left their home since the husband returned from China. They were not hospitalized and were isolated in their home.
San Diego County
The county reported two cases among people who were evacuated from Wuhan and flown to Marine Corps Air Station Miramar to be quarantined.
The first patient was mistakenly discharged from the hospital Feb. 9 and sent back to the base after a mix-up with the test results, but was returned to the hospital the following day for care.
Both patients have since recovered and been released.
County public health officials declared a local emergency on Feb. 14 in response to the virus.
An employee of an AT&T retail store in Chula Vista tested positive for the virus, prompting several stores in the area to be closed for deep cleaning, the company said in a March 5 statement. That employee lived in Orange County, county health officials said.
Health officials announced a presumptive positive case of the coronavirus Monday. A woman in her 50s who had traveled overseas was hospitalized and remains in isolation with serious symptoms, officials said.
San Francisco County
The first two were reported on March 5; the individuals were not related, had no history of travel to a location with confirmed coronavirus infections, and had no known contact with a confirmed case. One was a man in his 90s, hospitalized in serious condition and with underlying health condition; the other was a woman in her 40s, who was hospitalized in fair condition.
Six more were confirmed on Saturday. Each had a known contact with someone found to be infected with the virus.
Officials announced five new cases Monday, bringing the count to 13. Two of those cases are the result of community transmission.
The San Francisco Department of Emergency Management reported one new case Tuesday, bringing the county’s total to 14. Officials said that patient, who had known contact with another person who tested positive, is hospitalized.
On Wednesday, San Francisco announced a ban on gatherings of more than 1,000 people as the city fights to slow the spread of the disease.
San Mateo County
San Mateo County initially reported two cases of the virus. The first was a person who was repatriated to the U.S. by the Centers for Disease Control and Prevention. That person was in isolation and in good condition, officials said last week.
Also early last week, officials reported their second positive case of the virus. The source of exposure was unknown, as the person had no known exposure to the virus through travel or contact with another infected person. The patient was hospitalized and in isolation, officials said.
As of Wednesday, the number of positive cases in the county stood at 15.
Santa Clara County
Santa Clara County remains the largest outbreak in California, with at least 48 confirmed cases, up by 3 late Wednesday.
On Monday, the county announced its first death related to the coronavirus — a woman in her 60s who had been hospitalized for several weeks.
Authorities announced the first case Jan. 31, a Santa Clara County man who fell ill after his Jan. 24 return from China. Officials said the man had self-isolated at his home, leaving twice to seek medical care.
Three more cases associated with travel were reported in the county. On March 1, officials announced that a husband and wife who had recently visited Egypt were hospitalized with COVID-19.
A bigger concern, officials said, was an older adult woman who was infected but had no known exposure through travel or contact with another infected person. The woman had been hospitalized for a respiratory illness.
Two more cases announced March 3 prompted county officials to warn people over 50 and with medical conditions to avoid large gatherings, such as sporting events and concerts. The county also announced three more cases Wednesday.
On March 5, Santa Clara County announced six more cases — three men and three women. Four of them were close contacts with other confirmed cases and were isolated at home. Two of them were hospitalized.
County health officials recommended that large events be postponed or canceled and that employers take steps to make it more feasible for employees to work in ways that minimize group gatherings and contact with others.
On Friday, public health officials reported four new cases. One was a man whom officials described as a household contact of a previously confirmed case in the county, and one was a man who had recently returned from a trip to India, officials said. Both people were isolated at home.
Officials weren’t sure how the other two people contracted the virus. One was a man who was isolated at home; the other was a woman who was hospitalized, officials said. Both cases were under investigation.
On Saturday, eight new cases were reported. All were said to be under investigation.
Santa Cruz County
On Saturday, a Santa Cruz County resident was confirmed to be infected with the virus. The person was previously on the Grand Princess cruise ship journey between San Francisco and Mexico between Feb. 11 and Feb. 21.
Health officials announced a second case in the county Monday. Investigators have determined that person, who had previously traveled to Seattle, likely contracted the virus there before flying home.
Most of the cases in Solano County are associated with evacuees from the Diamond Princess cruise ship, where passengers were quarantined off Japan after some of those who had boarded tested positive for the coronavirus.
Some of the evacuees were taken to Travis Air Force Base in Fairfield. Of those who arrived there, 21 tested positive, the CDC said Feb. 26. Some of them were then transferred to hospitals outside the county.
Solano County is also where the first confirmed case of community spread in the U.S. was reported.
An older woman who was hospitalized at NorthBay VacaValley Hospital with fever and breathing problems was transferred to UC Davis Medical Center, where she was eventually diagnosed with COVID-19, officials announced Feb. 26. She was “in her community” for several days before accessing care, officials said.
The woman had not recently traveled to a high-risk area, nor had she been in contact with someone with the virus. She was not tested for several days after her initial hospitalization because she did not fit screening criteria set by the CDC at the time. The guidelines have since been revised.
More than 100 people, most of whom were health workers who had contact with the woman, were asked to self-quarantine. On March 1, officials announced that one of them, a worker at NorthBay VacaValley Hospital, was also diagnosed with coronavirus and was in in isolation at home.
The CDC has dispatched a team to help local officials identify others who might have come in contact with the woman, who was reported to be slowly recovering. Officials said that, so far, her family members had tested negative for the virus but remained in quarantine.
On Feb. 27, the county declared a local emergency due to the virus.
As of Sunday, Solano County was reporting three confirmed cases of COVID-19, two of which involved residents contracting the disease in the community. That number had grown to six as of Tuesday.
Officials in Sonoma County declared a local health emergency March 2 after announcing two people had been diagnosed with the virus.
One patient, who officials said earlier last week was isolated and in stable condition, had recently traveled internationally on a Princess Cruises voyage.
On March 5, county health officials confirmed that a second cruise ship passenger had also tested positive. Both that patient and the one announced earlier in the week were in isolation rooms at a local hospital.
Stanislaus County confirmed its first two positive cases Wednesday.
One of the individuals was a passenger on the Grand Princess cruise to Mexico and officials said the other is likely a case of community transmission as that person had not traveled anywhere with a known outbreak or been in contact with someone who previously tested positive.
Tulare County announced its first case of the coronavirus late Wednesday.
“It is believed that the virus was contracted out of the area and the individual did enter public areas while showing symptoms,” Tulare County Health and Human Services’ Public Health branch said in a statement.
The person is in stable condition, the statement said.
The county reported its first case of the new coronavirus on Friday — a passenger on the Grand Princess cruise ship who had mild symptoms and was being quarantined at home, officials said.
The person had remained at home resting since returning from the cruise on Feb. 21 and only left to seek medical attention, officials said.
County public health officials said they were working with the state Department of Public Health to notify anyone else who might have come into contact with the person while the individual was seeking medical attention or in transit to Ventura County from San Francisco, where the person disembarked the ship.
The person’s spouse, who was also on the cruise but did not have symptoms of the virus, was also being quarantined at home, officials said.
A total of six Ventura County residents had traveled on the cruise, and public health officials contacted all of them, the Ventura County Public Health Department said in a news release. Of the four remaining residents who were passengers, one was symptomatic and being tested, officials said. The other three had reported no symptoms.
The county announced a second confirmed case Wednesday, a traveler who returned from a trip to Italy and became sick. That person has been quarantined at home after being tested by a healthcare provider in a neighboring county, officials said.
The county’s Public Health Lab has conducted 77 COVID-19 tests and only returned the two presumptive positives. More than two dozen other travelers have been quarantined at home, county officials said. There have been no confirmed person-to-person transmissions in Ventura County.
Yolo County reported its first case Friday, a woman who officials think contracted the virus in the community.
The woman had underlying health conditions and was hospitalized, officials said. She appeared to have acquired the virus “through community transmission,” the Yolo County Health and Human Services Agency said in a news release. The agency was planning to monitor the woman’s close personal contacts for symptoms of the illness and said staff was working with healthcare providers to identify potential additional cases.
The county planned to declare local and health emergencies, the agency said.