In the vaccine group, 47 subjects did not receive the full three doses of vaccine because 4 were lost to follow-up, 5 had an adverse event, 7 had a compliance issue, 5 withdrew from the study, 2 were found to have CMV infection, 6 became pregnant, and 18 were unable to receive the vaccine owing to its unavailability. In the placebo group, 60 subjects did not receive three doses of placebo because 16 were lost to follow-up, 2 had an adverse event, 4 had a compliance issue, 4 withdrew from the study, 4 were found to have CMV infection, 13 became pregnant, and 17 were unable to receive placebo owing to its unavailability.