›› 2018, Vol. 45 ›› Issue (9): 2550-2558.doi: 10.16431/j.cnki.1671-7236.2018.09.027

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Isolation, Identification and Genetic Evolution Analysis of Chicken Pathogenic Proteus mirabilis

XU Rui1,2, LI Yantao1   

  1. 1. Department of Animal Science, Xichang University, Xichang 615000, China;
    2. Key Laboratory for Control and Prevention of Animal Blight in Panxi, Xichang 615013, China
  • Received:2018-03-16 Online:2018-09-20 Published:2018-09-26

Abstract:

In order to understand the drug resistance,virulence and genetic characteristics of chicken source Proteus mirabilis,2 strains of bacteria (YLF1 and WS strains) were prepared by isolation from the Liangshan area,and they were identified by culture characteristics,microscopic characteristics and 16S rRNA sequence determination,and pathogenicity test.Then the sensitivity of the bacteria to 14 commonly used antibiotics (including β-lactams,ceftenes,aminoglycosides,tetracyclines,fulro quinolones and macrolides) was determined using the (K-B) method;The phylogenetic analysis of the 16S rRNA gene sequences of Proteus from 21 different sources published in GenBank was carried out.The results showed that the YLF1 and WS strains all had migratory and β-hemolytic growth characteristics.The microscopic examination showed gram-negative bacilli or cocci varied in length,the homology of them with Proteus mirabilis in GenBank through the 16S rRNA gene identification was above 99%,YLF1 and WS strains were identified as Proteus mirabilis;YLF1 and WS strains showed multiple drug resistance,the drug resistance rates were 78.6%(11/14) and 71.4%(10/14),respectively,the mortality rate of chicks was 80%,the YLF1 and WS strains had the highest homology with Japanese isolate from human,Xinjiang isolate from cattle and Guangdong isolate from soil (99.9%),and they were highly homologous to chicken source Proteus mirabilis from Henan,Xinjiang and India (98.9% to 99.3%),and the genetic relationship was close.These results indicated that Proteus mirabilis infection existed in the chicken populations of Liangshan area.The isolates had high virulence and strong resistance,it also suggested that the isolates might be from the environment,infected chickens or other animals,and there was a potential risk of zoonotic diseases.

Key words: chicken; Proteus mirabilis; isolation and identification; genetic evolution analysis

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