The CDC, which was monitoring experience with RotaShield, called for an immediate halt to the immunization program, thereby sinking a vaccine that had taken15 years and several hundred million dollars to launch.

• 负责监测轮盾使用状况的cdc，马上宣布中止这项接种计画；这个耗时15年、费数亿美元才问世的疫苗，就因此泡汤。