Researchers are studying a medicine called letermovir to help prevent a virus called cytomegalovirus (CMV) in kids who have had a kidney transplant and weigh less than 88.2 pounds. A kidney transplant means a person gets a new kidney from another person. CMV is a virus that can make you sick, especially if you've had a transplant. This study will check how letermovir moves through the body and see if it is safe for kids.
To join the study, participants must have had their kidney transplant 4 to 52 weeks ago, cannot have CMV, and must not be on dialysis (a machine that cleans the blood). They should also weigh at least 5.5 pounds.
- This study may last several weeks, with visits needed to check how the medicine is working.
- Participants must be able to take medicine by mouth or through a tube.
- The study will check if the medicine is safe and how it affects the body.