Evaluation of Lung Scoring System and Serological
Analysis of Actinobacillus
pleuropneumoniae Infection in Pigs
Shi-Wei Liao1§, Jen-Jie Lee2§, Fon Chen2, Wei-Cheng Lee2,
Ying-Chen Wu2, Shih-Ling Hsuan2, Chih-Jung Kuo3,
Yi-Chih Chang4,* and Ter-Hsin Chen1,2*
1Graduate Institute of
Microbiology and Public Health, College of Veterinary Medicine,
National Chung Hsing University, 145 Xingda Rd., South Dist.,
Taichung 402, Taiwan; 2Graduate Institute of Veterinary
Pathobiology, College of Veterinary Medicine, National Chung Hsing
University, 145 Xingda Rd., South Dist., Taichung 402, Taiwan;
3Department of Veterinary Medicine, College of Veterinary
Medicine, National Chung Hsing University, 145 Xingda Rd., South
Dist., Taichung 402, Taiwan; 4Department of Medical
Laboratory Science and Biotechnology, China Medical University, 91
Hsueh-Shih Road, Taichung 40402, Taiwan *Corresponding author: yichih@mail.cmu.edu.tw; thc@dragon.nchu.edu.tw
Abstract
Actinobacillus pleuropneumoniae (A.
pleuropneumoniae) is a respiratory pathogen that causes a great economic
loss every year in the swine industry worldwide. The objective of this study was
to investigate the prevalence of pleuritis in central Taiwan using the
slaughterhouse pleurisy evaluation system (SPES) and to evaluate the
correlations among SPES, serum antibody (ApxI/Tbp2) positivity, and the presence
of apxIVA in lung tissue caused by
A. pleuropneumoniae. Lung and blood
samples were collected randomly from the slaughterhouse. The pleuritis lesions
were morphologically evaluated for a SPES score and then examined the positive
rate of apxIVA by PCR, and the blood
samples were analyzed by ELISA. The positive rate of the samples we collected
from slaughterhouse indicated that the prevalence of
A. pleuropneumoniae in central Taiwan
measured by SPES, ELISA, and PCR was 21.2, 40.6 and 23.7%, respectively.
Generally, the positive rate of serum antibody and
apxIVA detection increased when SPES values rose. However, the lungs
with SPES 4 presented a low ApxI/Tbp2 antibody titer in the sera, and that would
be considered as a secondary infection of
A. pleuropneumoniae because the lesion is usually accompanied by
extensive polyserositis. In conclusion, according to cross-comparison and
statistical analysis of our data, the serum antibody levels were strongly
correlated with SPES, which promises a fast and useful evaluation tool for
clinical investigation of A.
pleuropneumoniae infection.
Key words:
Actinobacillus pleuropneumoniae,
apxIVA, Pleuritis,
Serum antibody, Slaughterhouse pleurisy
evaluation system