The CDC is now recommending all adults between 19 and 59 be vaccinated for hepatitis B.
The CDC says adults over 60 who are at high risk for hepatitis B should also get vaccinated.
Southern 7 Health Department outreach coordinator Shawnna Rhine said left untreated, hepatitis B can lead to serious liver illness, including cancer.
"There are a handful of vaccines out there, that are actually cancer preventative vaccines, and hepatitis B is one of those," Rhine said.
The hepatitis B vaccine is given to infants now, but adults born before 1991 may not have received it. The CDC estimates that around 60 million people are not vaccinated.
The hepatitis B vaccine is a series of 3 shots. They are available at doctors offices or through your local health department.