Enzootic nasal tumor virus ENTV A

probable species in the genus Betaretrovirus. Causes enzootic nasal tumors in small ruminants. Sheep and goat genomes contain copies of closely related endogenous retrovirus sequences.

Palmarini M et al (2000) J Virol 74, 8065

enzyme conjugate Usually an antibody preparation to which an enzyme is linked covalently. The enzyme is chosen to produce a color reaction with an appropriate substrate; enzymes commonly used include alkaline phosphatase and horseradish peroxidase. Used in enzyme-linked immunosorbent assay and Western blotting.

enzyme elevating virus Synonym for Lactate dehydrogenase elevating virus.

EOP See efficiency of plating.

ephemeral fever virus See Bovine ephemeral fever virus.

Ephemerovirus A genus in the family Rhabdoviridae. The type species is Bovine ephemeral fever virus. Other species include Adelaide River virus and Berrimah virus, and possibly Kimberley virus, Malakal virus and Puchong virus. Virions are bullet-shaped, 140-200 nm long and 60-80 nm across. The virus genome is a 14.9 kb negative-stranded RNA molecule encoding 10 genes in the order 3'-N-P-M-G-Gns-a1-a2-P-y-L-5'. The viruses cause an economically important disease of cattle and water buffalo in tropical regions of Africa, Australia, the Middle East and Asia. Mortality is about 1-2%. Infection is transmitted by arthropods, both Culicoides sp and mosquitoes.

epidemic A sudden increase in the incidence of a disease, affecting a large number of susceptible hosts and spreading over a large area.

epidemic diarrhea of infant mice virus (EDIM) A probable species in the genus Rotavirus. Mainly attacks mice 11-15 days old, causing diarrhea and dirty yellow fur. Not necessarily fatal. Disease is most common in first litters. Replication in cell cultures is in doubt. Infectivity resists ether, chloroform and pH 3. A stock free of virus can be obtained by Cesarean section and fostering on disease-free females. Virus morphologically identical and antigenically very similar to human and other rotaviruses.

Kraft LM (1966) Natl Cancer Inst Monogr 20, 55

epidemic gastroenteritis virus Synonym for Norwalk virus.

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