| Summary |
There were six epidemics of bovine ephemeral fever (BEF) occurring in Taiwan during 1967 to 2001 (1967, 1984, 1989, 1996, 1999 and 2001). The epidemic cycles indicated that the intervals of epidemic were decreased and the courses of epidemic were increased. The purpose of this study was to provide a method for the surveillance system of BEF on serology. A total of 4361 cattle sera were collected from 16 prefectures of Taiwan during April and October in 2001. The mean titers of serum neutralizing (SN) titers rose from 104.70 in April to 146.22 in October. If the SN titers for protection from infection were ＞ 1: 64, there were only 47.46% of herds on April and 35.01% on October containing sufficient titers for protection. These results indicated that vaccination with the BEF inactivated vaccines wasn’t support the complete protection for cattle in the whole year. The coding region of the G protein was amplified by reverse transcriptase PCR and sequenced. Phylogenectic analysis revealed that the Australian strains and the Asian strains have segregated into two distinct genotypes.
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