PLACER COUNTY, Calif. — Three more people in Placer County have tested presumptive positive for coronavirus, the public health department announced.

The new cases are from Placer County include three people who traveled on the Grand Princess cruise ship from San Francisco to Mexico, according to health officials. The new cases bring the total number of positive or presumptive positive cases of coronavirus in Placer County up to five, counting the patient who died in Roseville.

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Officials say they are in the beginning stages of contact tracking anyone who may have been exposed to these newly diagnosed patients.

“We are moving as quickly as possible to limit the spread of disease,” Placer County Health Officer Dr. Aimee Sisson said. “To be frank, we would not be surprised to see a second wave of cases connected to these cruise passengers given the amount of time that’s passed since they disembarked.”

All three of the new cases are in home isolation and none have needed to be hospitalized. Officials say two of the patients had mild symptoms of coronavirus that have already resolved. The third patient is still showing mild symptoms.

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According to the CDC, coronavirus (COVID-19) is a family of viruses that is spreadable from person to person. Coronavirus is believed to have been first detected in a seafood market in Wuhan, China in December 2019. If someone is sick with coronavirus, the symptoms they may show include mild to severe respiratory illness, cough, and difficulty breathing.

Currently, there is no vaccine, however, the CDC suggests the following precautions, along with any other respiratory illness:

  • 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 with soap and water for a minimum of 20 seconds.

The CDC also says facemasks should only be used by people who show symptoms of the virus. If you’re not sick, you do not have to wear a facemask. The CDC says the immediate risk to the U.S. public is low.

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