Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (4): 706-712.DOI: 10.3969/j.issn.1004-1524.2022.04.06

• Animal Science • Previous Articles     Next Articles

qPCR detection of bacterial pathogens of respiratory diseases in calves of a dairy farm from Sichuan

CHEN Jiubing1(), GENGSHANG Jingchao1,2, WANG Fangguo1,2, CHEN Yating1, ZHOU Jinwei3, LUO Qiao1, MA Li1, YAO Xueping1, YU Shumin1, SHEN Liuhong1, CHU Yuefeng2, CAO Suizhong1,*()   

  1. 1. College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
    2. State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
    3. Agriculture and Rural Bureau of Pujiang County, Pujiang 611630, Sichuan, China
  • Received:2020-10-10 Online:2022-04-25 Published:2022-04-28
  • Contact: CAO Suizhong

Abstract:

In order to explore the pathogens of bovine respiratory disease(BRD) in a large-scale dairy farm in Sichuan Province, TaqMan fluorescent quantitative PCR method was used to analyze 75 nasal cotton samples from the calves with respiratory disease symptoms and 10 other samples during 2019 to 2020 for common bacterial pathogens. The results showed that the detection rates of Pasteurella multocida(Pm), Histophilus somni(Hs), Mycoplasma bovis(Mb), Trueperella pyogenes(Tp) and Mannheimia haemolytica(Mh) were 57.33%(43/75), 38.67%(29/75), 13.33%(10/75), 12.00%(9/75), 8.00%(6/75). The single infection rate was 36.00% (27/75), mainly caused by Pm, accounting for 24.00%(18/75); the mixed infection rate was 40.00%(30/75), especially the mixed infection caused by Hs and Pm, accounted for 18.67%(14/75).The results showed that all five common BRD bacterial pathogens were detected, and there were many types of mixed infections. The high detection rate of Hs indicated that it had a certain connection with BRD in China, and it was necessary to carry out further epidemiological investigations nationwide.

Key words: bovine respiratory disease, TaqMan real-time PCR, Histophilus somni, mixed infection

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