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The first case of coronavirus in Ventura County has been confirmed, according to county public health officials and the CDC.

Here's what we know about the case, the virus and other prevention measures.

Where was the first Ventura County coronavirus case?

The first case of novel coronavirus in Ventura County involves a patient who traveled on the Grand Princess cruise ship that went from San Francisco to Mexico.

The local patient remained at home after returning from the cruise, officials said, leaving home only for medical attention. A primary-care doctor requested the traveler stay in his or her vehicle while a specimen for testing was dropped off to limit any exposure.

The test came back Thursday with preliminary positive results, and the results were confirmed by the U.S. Centers for Disease and Control Prevention in Atlanta. The patient's spouse was also on the cruise but has shown no symptoms and remains in quarantine.

Lab tests on a second cruise ship passenger from Ventura County showed no signs of coronavirus, public health officials said late Friday.

Dr. Robert Levin, Ventura County public health officer, said the risk to the public remains low.

Coronavirus in Ventura County: Click here for more information on this case

What do we know about the coronavirus in California?

As of Sunday, California had 114 confirmed cases, according to the state Department of Public Health.

Vice President Mike Pence said on Friday that of the 46 people tested for coronavirus aboard the Grand Princess cruise ship, 21 have tested positive for the virus. Of them, 19 were crew members and two were passengers.

But cruise ship passengers will be allowed to disembark Monday.

What are the coronavirus symptoms?

Symptoms of COVID-19 can range from mild to severe, and the virus can also be asymptomatic, meaning some people don't have any symptoms at all.

The most common symptoms mirror the flu and include fever, tiredness and dry cough. Some people also develop aches and pains, nasal congestion, runny nose, sore throat or diarrhea.

More on the coronavirus:County calls for plans to cut contact, coronavirus risks

Tips to protect yourself and others from coronavirus

To avoid being exposed to the virus, the CDC recommends the following preventive actions:

Avoid close contact with people who are sick.

Avoid touching your eyes, nose, and mouth.

Stay home when you are sick.

Cover your cough or sneeze with a tissue, then throw the tissue in the trash.

Clean and disinfect frequently touched objects and surfaces using a regular household cleaning spray or wipe.

Wash your hands often with soap and water for at least 20 seconds, especially after going to the bathroom; before eating; and after blowing your nose, coughing, or sneezing.

If soap and water are not readily available, use an alcohol-based hand sanitizer with at least 60% alcohol. Always wash hands with soap and water if hands are visibly dirty.

If you are traveling, click here to find the CDC's specific set of recommendations.

Coronavirus fatality rates on the rise

As of this week, the World Health Organization reported that the death rate for COVID-19 increased from roughly 2% to 3.4% and is more lethal than the flu, which kills tens of thousands of Americans each year.

There are currently 21 deaths and 537 confirmed cases from coronavirus in the U.S. across 34 states and the District of Columbia. Worldwide, more than 3,800 people have died from the virus.

Tedros Adhanom Ghebreyesus, head of the World Health Organization, stated, "While many people globally have built up immunity to seasonal flu strains, COVID-19 is a new virus to which no one has immunity; that means more people are susceptible to infection, and some will suffer severe disease."

You have questions about coronavirus. We have answers.

Health reporter Tom Kisken contributed to this report.

Joe Jacquez is a digital producer with the USA Today Network. You can find him on Twitter @JoeJacquezAZ.