Bordetella bronchiseptica were isolated from nasal swabs of the pigs being raised in Eastern Gyeong Nam area from September to December, 1990. Servey on isolation frequency, antimicrobial susceptibility and serum agglutination antibody titer were carried out. The results obtained were summarized as follows : 1. Isolation of B. bronchiseptica were 47 pigs in 113, shown 41.6% of isolation rate and isolation rate were higher in non-vaccination group(60.0%) than vaccination group(28.8%), 2. Isolation rate by ages were the lowest below 1 week ages(22.2%), the highest in 78 weeks ages(55.6 %) and sows was shown 39.3%. 3. It was also found that 47 strains of B. bronchiseptica isolated were highly susceptibility to minocyclin, gentamicin, neomycin, colistin and kanamycin, and highly resistant to penicillin, linsmycin, bacitracin, sulphonamides and chloramphenicol. 4. Isolation rate by the difference of seum agglutination antibody titer were more high at low agglutination titer than high agglutination titer.