This study tests a new vaccine for a virus called Cytomegalovirus (CMV) in people waiting for a liver transplant. CMV is a virus that can cause problems in people with weak immune systems, like those getting a new liver. The study gives two doses of a special CMV vaccine before the transplant to see if it helps reduce the need for antiviral medicine after the transplant.

• Must be able to understand and agree to join the study.
• Women should not be pregnant or breastfeeding and must use birth control.
• Cannot have had a CMV vaccine or certain treatments in the past 3 months.

Participants will have regular checkups and follow-ups. If you join, make sure you are not part of another study and haven't had some treatments like certain vaccines. Always check with your doctor about the safety and benefits of joining this study.