3747027 EEHV-HD elephant endotheliotropic herpesvirus hemorrhagic disease 17 3747026 EEHV-HD EEHV hemorrhagic disease 4 3747028 EEHV-HD EEHV-specific antibody levels, may develop fatal hemorrhagic disease 1 3747029 EEHV-HD EEHVs cause a fatal hemorrhagic disease 1 3747030 EEHV-HD elephant endotheliotropic herpesvirus infection 1 3747031 EEHV-HD endotheliotropic herpesvirus causes a hemorrhagic disease 1