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Serotype and apx genotype profiles of Actinobacillus pleuropneumoniae field isolates in Korea
  1. K. Min, DVM, MS1 and
  2. C. Chae, DVM, MS, PhD1
  1. 1 Department of Veterinary Pathology, College of Veterinary Medicine, Seoul National University, Suwon 441-744, Kyounggi-Do, Republic of Korea


A total of 100 field isolates of Actinobacillus pleuropneumoniae isolated from lung tissues of pigs with severe pleuropneumonia were serotyped by slide agglutination and precipitation tests. Polymerase chain reactions for apxICA, apxIICA, apxIIICA, apxIBD and apxIIIBD genes were used to determine their genotype prevalence. Serotypes 2 (56 isolates), 5 (28 isolates) and 6 (11 isolates) were the most common; only two isolates belonged to serotype 7, and three were untyped. Among the 97 isolates identified by serotype, 70 had the same apx genes as their respective serotype reference strains, but 27 did not have any of the apx genes present in the corresponding serotype reference strain. Among these 27 isolates, 10 were serotype 2, 12 were serotype 5, three were serotype 6 and two were serotype 7.

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