1. Characterization of Actinobacillus pleuropneumoniae isolated from pigs in Japan using whole genome sequencing.
- Author
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Ozawa M, Kawano M, Abo H, Issiki Y, Kumakawa M, Kawanishi M, Kojima A, and Iwamoto S
- Subjects
- Swine, Animals, Japan epidemiology, Phylogeny, Anti-Bacterial Agents pharmacology, Whole Genome Sequencing veterinary, Actinobacillus pleuropneumoniae genetics, Swine Diseases epidemiology, Actinobacillus Infections veterinary
- Abstract
We conducted whole-genome sequencing to investigate the serotypes, the presence of virulence and antimicrobial resistance genes, and the genetic relationships among isolates of Actinobacillus. pleuropneumoniae derived from diseased pigs. Serotype 2 (71.2%) was the most common, but the prevalence of serotypes 6 (13.6%) and 15 (6.8%) increased. Existing vaccines are considered ineffective on the isolates belonging to serotypes 6 and 15. The phylogenetic tree based on core genome single nucleotide polymorphisms showed that the isolates were clustered by serotype. Of the isolates, 62.5% did not have an antimicrobial resistance gene, including a florfenicol resistance gene, but 32.2% had a tetracycline resistance gene. The antimicrobial resistant phenotype and genotype were almost identical. The plasmid-derived contigs harbored resistance genes of aminoglycosides, tetracyclines, β-lactams, phenicols, or sulfonamides. It has been suggested that isolates with different genetic properties from vaccine strains are circulating; however, antimicrobial resistance may not be widespread., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)
- Published
- 2023
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