Officials are investigating a potential case of hantavirus, a rare but deadly disease that attacks the lungs, in an inmate at the San Quentin Rehabilitation Center in Marin County, California.

The California Department of Corrections and Rehabilitation, which manages the state’s prison system, “is waiting for more lab test results for an inmate with symptoms,” Kyle Buis, spokesperson for the California Correctional Health Care Services, told The Mercury News on Thursday.

The Los Angeles Times reached out to the San Quentin Rehabilitation Center but did not receive a response before publication.

The prison is designed to hold more than 3,000 individuals and it currently houses low- and medium-security inmates, according to the CDCR.

Officials have decontaminated the facility’s inmate housing as a precaution and medical staff are monitoring prisoners and staff for possible symptoms, The Mercury News reported.

Though hantavirus cases are rare, several have been making headlines of late.

Five California residents were exposed to a strain of the hantavirus, known as Andes virus, that spread on a Dutch cruise ship and killed three people.

Typically, hantavirus spreads by inhaling particles contaminated with the urine, feces or saliva of wild rodents.

The Andes virus that was spread on the cruise ship is a strain of the hantavirus that’s spread from human to human.

There have been 890 laboratory-confirmed cases of hantavirus disease reported in the United States since surveillance began in 1993, according to the most recent data from the U.S. Centers for Disease Control and Prevention.

The data suggest that contracting hantavirus is rare, said Dr. Afif El-Hasan, a member of the American Lung Association’s national board of directors.

“That being said, it’s probably underdiagnosed because the symptoms are a lot like the flu or other illness,” El-Hasan said. “And a lot of people may have passed away or had hantavirus, but it was never diagnosed.”

There is no vaccine or specific antiviral medicine for hantavirus.

Intensive care treatment may include intubation and oxygen therapy, fluid replacement and use of medications to lower blood pressure, according to the American Lung Association.

Last year, when actor Gene Hackman and his wife Betsy Arakawa were found dead in their New Mexico home, authorities determined that Arakawa had died by complications caused by the hantavirus, with evidence of rodents on the property.

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