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Haartman Institute, Department of Virology, POB 21, FIN-00014 University of Helsinki, Finland
Inkoo (INK) and Tahyna (TAH) viruses, European representatives of the California serogroup (CAL), genus Bunyavirus, family Bunyaviridae, are transmitted by mosquitoes and frequently infect man. The S segments of INK and TAH prototype strains were amplified, cloned and sequenced. INK S consists of 986 and TAH S of 977 nucleotides (nt) coding for a nucleocapsid protein of 235 amino acids (aa) and, in an overlapping reading frame, for a nonstructural protein of 92 or 97 aa, respectively. By S segment sequences and phylogenetic analysis INK was seen to be most closely related to Jamestown Canyon virus, isolated in the USA (92.4% nt and 96.6% aa identity), which is currently classified in a different subcomplex within the CAL viruses. TAH was genetically closest to Lumbo virus, isolated in Mozambique (89.0% nt and 94.1% aa identity). The data suggest that genetic variation within the CAL viruses is less related to geographical distance than to similarity in ecological cycles.
Received 1 February 1996;
accepted 26 April 1996.
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