Published in Medical Letter on the CDC and FDA, July 16th, 2006
According to their report, "The molecular epidemiology of Bluetongue virus serotype 11 (BTV11) in an enzootic focus in northern Colorado was investigated. Viruses isolated up to 12 years apart, from both vertebrate and invertebrate hosts, were compared by phylogenetic analysis of nucleotide sequence data from three genome segments: L2, S7, and S10. For each segment, viruses isolated from ruminants in the 1980s were more similar to one another than to viruses isolated from Culicoides species insects in the 1990s."
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