SACRAMENTO -- A California resident who recently traveled to West Africa and was feared to have contracted Ebola has tested negative for the deadly virus, state and federal health officials said Thursday.

The patient, whose age and sex have not been revealed, has been kept in an isolation unit at a Kaiser hospital in Sacramento after returning from West Africa. More than 1,000 people have died in West Africa over the past month from the virus, for which there is currently no vaccine.

The person has been kept in a specially equipped negative pressure room at the South Sacramento Medical Center while tests were being conducted, public health officials said. All staff were also educated about the virus, which has a fatality rate of up to 90 percent.

Ebola can only spread through direct contact with the infected person, such as through broken skin, blood, urine or saliva and not through food, air or water, according to the Centers for Disease Control. Symptoms may appear anywhere from two to 21 days after exposure and include fever, headache, joint and muscle aches, weakness, diarrhea, vomiting, stomach pain and abnormal bleeding.

Officials stressed Thursday night that California has no known Ebola cases and the Sacramento patient was the first in the state to be tested for the infectious disease.

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