The present study was conducted to investigate the biochemical and serologic characteristic of Actinobacillus pleuropneumoniae isolated from pneumonic lungs of pigs during the period from January 1992 to April 1993.
A pleuropneumoniae was isolated from 17(27.0%) of 63 growing pigs with respiratory signs and 21(6.4%) of 330 pneumonic lungs of slaughtered pigs.
The seasonal isolation frequency of A pleuropneumoniae was higher in winter and spring than that in summer or fall.
The biochemical and cultural properties of A pleluropneumoniae isolated from the pneumonic lungs of pigs were identical to those of the reference strains used.
The isolates were highly susceptible to ampicillin, cephalothin, ceftiofur, ciprofloxacin(MIC:≤0.39㎍/㎖) and moderately susceptible to amikacin, chloramphenicol, erythromycin, kanamycin, methicillin, penicillin-G, streptomycin(MIC:0.78∼25IU or ㎍/㎖), respectively. Sulfadimethoxine, sulfamerazine, tylosine showed no response to the isolates(MIC:≥100㎍/㎖).
Among the 38 isolates, 21(55.3%) and 13(34.2%) were resistant to oxytetracycline aid lincomydn, respectively(MIC:≥50IU or ㎍/㎖).
The majority of 38 A pleuropneumoniae isolates were turned out as serotype 2(47.4%) or serotype 5(94.7%) and the remaining 3 isolates were evenly classified to serotype 7. 10 or 12.
It was noted A pleuropneumonine serotype 5 isolates were more resistant to oxytetracycline than serotype 2 isolates.
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