Currently Merck manufactures the HPV (types 6, 11, 16, and 18) L1 virus like particle vaccine and a description has been reported previously. (18) Merck will supply the vaccine, which will be stored as directed by the manufacturer. The vaccine will be stored at the Medstar Research Institute (Women and Infants Research Services) It will be administered by intramuscular injection (0.5 mL) into the upper arm or thigh by the research nurse (Sarah Duwel, RN or a nurse working under supervision) in the transplant clinic.