Uasin Gishu disease virus, (UGDV), Poxviridae, 144

Uganda S virus, (UGSV), Flaviviridae, 866

Ulcerative disease rhabdovirus, (UDRV), Rhabdoviridae, 569

Ullucus mild mottle virus, (UMMV), Tobamovirus, 893

Ullucus mosaic virus, (UMV), Polyviridae, 712

Ullucus virus C, (UVC), Comoviridae, 695

Umatilla virus, (UMAV), Reoviridae, 419

Umbre virus, (UMBV), Bunyaviridae, 608

Una virus, (UNAV), Togaviridae, 885-887

Upolu virus, (UPOV), Bunyaviridae, 619

Urmurtia/338Cg/92 virus, Bunyaviridae, 611

Urochloa hoja blanca virus, (UHBV), Tenuivirus, 624-625

UR2 sarcoma virus, (UR2SV), Retroviridae, 374

Urucuri virus, (URUV), Bunyaviridae, 616

Ustilago maydis virus H1, (UmV-H1), Totiviridae, 495

Ustilago maydis killer M virus, Satellite, 1028

Usutu virus, (USUV), Flaviviridae, 866

Utinga virus, (UTTV), Bunyaviridae, 607

Utive virus, (UVV), Bunyaviridae, 608

Uukuniemi virus, (UUKV), Bunyaviridae, 600, 602, 616, 620, 626

Uukuniemi virus S 23, (UUKV), Bunyaviridae, 616