The Wyoming Department of Health says it has confirmed a fourth case of listeria-related illness in the state but is still researching whether it’s associated with tainted cantaloupe.

Health Department spokeswoman Kim Deti said Wednesday that an elderly man in Lincoln County has been diagnosed recently as Wyoming’s fourth recent case of listeriosis.

A Sheridan woman has died and a man and woman from Laramie County have been sickened by the disease in recent weeks. Deti says the Lincoln County man is still alive and authorities are looking into how he contracted the disease.