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Four firefighters with the Orange County Fire Authority who were isolated after being exposed to a person who was showing symptoms similar to coronavirus were released after the patient tested negative for the illness, officials said.

The patient, who recently traveled internationally, was transported to the hospital by the firefighters on Saturday, Colleen Windsor, a spokeswoman for the agency, told KTLA.

The firefighters were being isolated at Irvine Station 20 out of an abundance of caution, Windsor said. The station, located at 7050 Corsair, was temporarily out of use.

The patient who was showing symptoms was tested Monday and the agency shared on Twitter that the results were negative.

No further details about the patient, including where that person traveled, were released.

There are 91 cases of coronavirus in the U.S., according to health officials. Ten states have reported cases and a total of six people have died in Washington state.

Globally, the virus has spread to 60 countries, and more than 3,000 people have died from the COVID-19 illness it causes.