Characterization and Application of a Lytic Phage D10 against Multidrug-Resistant <i>Salmonella</i>
Zhiwei Li | Wanning Li | Wenjuan Ma | Yifeng Ding | Yu Zhang | Qile Yang | Jia Wang | Xiaohong Wang
<i>Salmonella</i> is a widely distributed foodborne pathogen that is a serious threat to human health. The accelerated development of drug resistance and the increased demand for natural foods invoke new biocontrol agents to limit contamination by multidrug-resistant (MDR) <i>Salmonella</i> strains. In this study, a lytic <i>Salmonella</i> phage named D10 was characterized at the biological and genomic levels. D10 possesses a short latent period (10 min) and a large burst size (163 PFU/cell), as well as adequate stability under a range of pH conditions and moderate thermal tolerance. D10 effectively lysed different MDR <i>Salmonella</i> serovars and repressed their dynamic growth in the medium. Genomic analysis disclosed that D10 is a new member of the <i>Siphoviridae</i> family and lacks the genes implicated in lysogeny, pathogenicity, or antibiotic resistance. A three-ingredient phage cocktail was then developed by mixing D10 with previously identified myovirus D1-2 and podovirus Pu20. The cocktail significantly reduced the count of MDR strains in liquid eggs, regardless of the temperature applied (4 and 25 °C). These results suggest that phage D10 is a promising tool to prevent food contamination by MDR <i>Salmonella</i>.
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