China Animal Husbandry and Veterinary Medicine ›› 2023, Vol. 50 ›› Issue (10): 4168-4178.doi: 10.16431/j.cnki.1671-7236.2023.10.031

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation,Identification and Characterization of a Strain of Salmonella Phage

LIAO Binru1, YU Chunyan1, HUANG Qiaochen1, MO Yupeng1,2, HUANG Weiqian1,3, LI Lei1, HAN Kaiou1, WANG Leping1, LI Xun1, WANG Xiaoye1   

  1. 1. Guangxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi Colleges and Universities Key Laboratory of Prevention and Control for Animal Disease, College of Animal Science and Technology, Guangxi University, Nanning 530004, China;
    2. Guilin Liyuan Group, Guilin 541012, China;
    3. Guangdong Rongda Biological Co., Ltd., Qingyuan 515000, China
  • Received:2023-04-25 Online:2023-10-05 Published:2023-09-26

Abstract: 【Objective】 It was aimed to isolate a phage with effective cracking for Salmonella,and provide experimental data and reference for exploring the countermeasure method of Salmonella.【Method】 Salmonella Pullorum X-1014 was used as the host bacteria,and the phage was isolated and purified from sewage by double-layer plate method.The phage was evaluated by plaque and electron microscopy,host spectrum,biological characteristics test,antibacterial test in vitro and whole genome sequencing analysis.【Result】 A lytic phage was isolated and purified,named ZH5 (GenBank accession No.:OM864357.1),which could lyse Escherichia coli and Salmonella.The results of double-layer plate method showed that the plaque was transparent and the edge was clear.Electron microscopy showed that phage ZH5 had an icosahedral head with a straight diameter of about 50 nm,a tail with a length of about 20 nm.The phage ZH5 could lyse three strains of Salmonella and one strain of Escherichia coli.The results of biological characteristics showed that the optimal multiplicity of infection was 10,the incubation period was 20 min and the outbreak period was 60 min,and the lysis volume was about 139 PFU/cell.The acid-base tolerance range was pH 4.0-10.0,and it could survive for 30 min in the environment of 4-50 ℃.Phage ZH5 showed the best inhibitory effect on Salmonella X-1014 and CVCC 1806 when the multiplicity of infection was 10.The whole genome analysis showed that the length of the phage was 42 949 bp,and the GC content was 51.41%,of which the proportion of known functional coding sequences (CDS) was 52%.Phage linear alignment showed that the genome of phage ZH5 was the most similar to the Escherichia phage Minorna(identity 94.19%;cover 84%).Phylogenetic tree analysis showed that phage ZH5 belonged to the Drulisvirus genus.【Conclusion】 A phage capable of cross-host lysis of Salmonella and Escherichia coli was isolated,which provided a good theoretical material for further research on Salmonella antibacterial agents.

Key words: Salmonella; phage; biological characteristics; in vitroantibacterial effect; whole-genome analysis

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