A New Jersey man contracted a rare mosquito-borne virus that is known to infect only an average of 15 people in the U.S. each year, writes northjersey.com.

The man, a Sussex County resident in his 60s, tested positive for Jamestown Canyon virus after experiencing a fever and “neurological symptoms” and an “altered mental status” in May, according to the state Department of Health.

The man had not traveled prior to the onset of the illness, suggesting he was bitten by an infected mosquito near his home. He was discharged from a hospital to a long-term care rehabilitation center last week, said Donna Leusner, a Health Department spokeswoman.

It is only the second case of the virus ever detected in New Jersey, although like many insect-transmitted diseases it may be more widespread and go undetected. The first case was in 2015, also in Sussex County.

Most people who contract the virus do not have symptoms. But it can cause severe disease, including inflammation of the brain or the membranes around the brain and spinal cord, according to the Centers for Disease Control. There is no vaccine for the virus.