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. 1993 Sep;31(9):2339–2342. doi: 10.1128/jcm.31.9.2339-2342.1993

Evaluation of counterimmunoelectrophoresis for serotyping Actinobacillus pleuropneumoniae isolates and detection of type-specific antigens in lungs of infected pigs.

K R Mittal 1, S Bourdon 1, M Berrouard 1
PMCID: PMC265757  PMID: 8408552

Abstract

A rapid, simple, and accurate counterimmunoelectrophoresis technique was developed for serotyping cultures of Actinobacillus pleuropneumoniae as well as for detection of their type-specific antigens in the lung tissues of infected pigs. The counterimmunoelectrophoresis test correctly identified all of the reference antigens and more than 99% of 1,200 field isolates of A. pleuropneumoniae representing the 12 established serotypes within 1 h. Counterimmunoelectrophoresis and coagglutination tests did not differ broadly in sensitivity from each other. Both procedures were more rapid and more sensitive than immunodiffusion and indirect hemagglutination tests. A total of 355 lung tissue samples (130 lungs of pigs that died because of acute respiratory problems, 125 lungs of pigs from herds with chronically infected pleuropneumonia, and 100 lungs from apparently healthy pigs at the slaughterhouse) were examined for the presence of A. pleuropneumoniae type-specific antigens by counterimmunoelectrophoresis, coagglutination, and immunodiffusion tests. A. pleuropneumoniae type-specific antigen was found in all 55 samples from which the bacteria had earlier been isolated and in 27 specimens in which they had not been found. Detection of antigen in the lung tissues by coagglutination and counterimmunoelectrophoresis tests was found to be much simpler and much more rapid than conventional culture isolation. Both counterimmunoelectrophoresis and coagglutination tests were found extremely useful in the diagnosis of acute cases of porcine pleuropneumonia. However, these techniques were able to detect only some of the chronically infected carrier pigs.

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Selected References

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