Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (2): 300-309.DOI: 10.3969/j.issn.1004-1524.2022.02.11

• Animal Science • Previous Articles     Next Articles

Analysis of biological characteristics of Acinetobacter pittii from respiratory tract of beef cattle

FAN Lihong1(), WANG Zhisheng2, ZUO Zhicai1,*(), CAI Dongjie1, YI Jun3, MA Xiaoping1, GOU Liping1, WANG Wei3   

  1. 1. College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
    2. Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, China
    3. Sichuan Academy of Animal Husbandry,Chengdu 610066,China
  • Received:2020-10-21 Online:2022-02-25 Published:2022-03-02
  • Contact: ZUO Zhicai

Abstract:

In order to explore the differences in biological characteristics of Acinetobacter pittii isolated from respiratory tract of beef cattle in Nanchong, Yibin, and Shifang in Sichuan Province, five strains of Acinetobacter pittii were studied by bacterial staining, culture characteristics, biochemical test, 16S rDNA and gyrB gene sequence clustering analysis and MLST typing. The results showed that the mycelial morphology and the colonial morphology of 5 strains of Acinetobacter pittii on different media were similar. And the biochemical characteristics of the five strains were not completely consistent, which was mainly manifested in the citrate and arginine double hydrolysis test of ZZCSF1807-9, while malonate was negative, contrary to the other four strains. The 16S rDNA phylogenetic tree showed that all 5 strains were clustered in the same branch, while the gyrB phylogenetic tree showed that ZZCSF1807-9 was not in the same branch with the other 4 strains, and there was an evolutionary distance. MLST typing results showed that ZZCSF1807-9 was ST214, while the other 4 strains were the closest to ST321.The above results indicated that the five strains of Acinetobacter pittii derived from beef cattle with respiratory disease had certain differences in biochemical characteristic phenotype, gyrB gene and MLST type, and whether the differences were related to the environmental adaptation of each strain or the change in virulence remained to be further studied.

Key words: Acinetobacter pittii, biochemical characteristics, homology analysis, multilocus sequence typing (MLST)

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