Ulcerative stomatitis of cattle virus

Synonym for Bovine papular stomatitis virus, although other viruses may cause the same clinical picture.

ultracentrifuge A high-speed centrifuge that will generate forces up to 500000g. Used to separate and purify virus particles.

ultrastructure The fine structure of cells or viruses as revealed by the electron microscope.

Umatilla virus (UMAV) A species in the genus Orbivirus; with Llano Seco, Minnal and Netivot viruses forms the Umatilla virus serogroup. Isolated from the sparrow, Passer domesticus, and from mosquitoes of Culex sp in Oregon, Utah, Colorado and Texas, USA. Not reported to cause disease in humans.

Umbre virus (UMBV) A strain of Turlock virus in the genus Bunyavirus belonging to the Turlock serogroup. Isolated from mosquitoes and birds in Maharashtra, formerly Bombay State, India. Not reported to cause disease in humans.

UNAIDS United Nations Programme on HIV/AIDS.

Una virus (UNAV) A species in the genus Alphavirus. Isolated from mosquitoes of Psorophora, Aedes, Culex, Anopheles and Coquillettidia sp in Brazil, Panama, Trinidad, Colombia, French Guiana, Surinam and Argentina. Not reported to cause disease in humans.

Causey OR et al (1963) Am J Trop Med Hyg 12, 777

uncoating The release of nucleic acid from a virus in the process of viral infection of a cell. With some bacteriophages the viral coat remains outside the cell, and only the nucleic acid enters; thus penetration and uncoating take place together. In animal cells uncoating may occur as a result of fusion of the virus and cell membranes or in the cytoplasm. In some viruses, e.g. reoviruses, only partial uncoating occurs, and virus gene expression and release of mRNAs occurs without release of the genome from the core.

Helenius A (1995) Cell 81, 651

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