Serological investigations were conductel when Bovine Ephemeral Fever (BEF) outboke and prevailed in Taiwan in 1984. The neutralization antibcdy (NA) titer in the sea of ruminant, including cattle (Flolsteins, Tellow Cattle and Hybrid Catte), water buffalces, gceis, sheep and deer was measured, The sea of horses, pigs, chickens, ducks, wild birds (15 srthes) and humans were also test.
High positivee ate of NA titers was found in the sea of dairy (Holstein) cattle (74.5%) , Yellow Cattle (44.0%), Hybid Cattle (1CO.0%), water buffaloes (66.6%), gceis (47.8%) and deer (38.5%). While that of sheep was also p€itive though it was low (6.3%).
All of the sea of horses, pigs, chickens, ducks, wild birds and human were negative.