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The complete nucleotide sequences of the S1 and N genes of three Japanese and one Taiwanese field strains of IBV are reported. These Japanese strains were found to have S1 sequences most similar to those of Australian strains and N sequences most similar to those of North American strains. This result suggested that these Japanese strains might all be recombinant viruses derived from recombination of Australia-and North America-related viruses. Moreover, the S1 proteins of all these Japanesedoi:10.1292/jvms.66.555 pmid:15187369 fatcat:btimohunizgjjivjmcy6flsth4