The mascot was seen walking around the field holding a sign that read "Towels carry Ebola," in reference to the Terrible Towels used by Steelers fans at games.
Social media reacted extremely negatively to the sign on Sunday.
According to ESPN.com, Curtis Dvorak was wearing the costume Sunday. He's dressed as the mascot for 18 years.
The recent outbreak and spread of Ebola has made international news. Over 7,000 cases of the viral disease have been reported worldwide, and over 3,000 deaths have been confirmed in in the African nations of Guinea, Liberia and Sierra Leone.
The first case of Ebola in the U.S. was reported last week. A man in Dallas is currently still fighting the disease.
The Jaguars lost to the Steelers 17-9 and are 0-5 this season.
- Ben Estes