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Two predominant electropherotypes of bluetongue virus (BTV) serotype 11 isolates from cattle during a 1981–1984 field study in eastern Colorado were characterized. The genomes of strains isolated from the first 2 years of the study had 1 predominant electropherotype (CO81), with the exception of 1 isolate that differed only in the migration of segment 3. A second electropherotype (CO83), with differences in the migration of 4 segments, coexisted in the same region during 1983 and 1984 with strains having the CO81 RNA profile. The genomes of CO81 and CO83 were also distinguishable from those of the US prototype of BTV 11. Analysis of the polypeptides of representative strains of each electropherotype by sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicated that the proteins were very similar. The occurrence of the CO81 electropherotype was apparently the result of multiple viral infections since the positions of 7 segments had faint second bands and single-banded variants were isolated after serial plaque purifications. In addition, protein 7 of 1 of the CO81 isolates and protein 7 of the single-banded variant differed as shown by reverse phase-high performance liquid chromatography of  35 S-methionine-labeled tryptic peptides.

Genotypic Transitions among Bluetongue Viral Isolates from Domestic Ruminants in Colorado during 1981–1984