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Complete Genome Sequence of Stenotrophomonas maltophilia Siphophage Silvanus. Microbiol Resour Announc 2022; 11:e0121021. [PMID: 35225669 PMCID: PMC8928760 DOI: 10.1128/mra.01210-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Stenotrophomonas maltophilia is an opportunistic Gram-negative bacterium capable of causing respiratory infections. S. maltophilia siphophage Silvanus was isolated, and its 45,678-bp genome is not closely related to known phages based on whole-genome comparative genomics analysis. It is predicted to use cos-type packaging due to the similarity of its large terminase subunit to that of phage HK97.
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Zhou WY, Sun SF, Zhang YS, Hu Q, Zheng XF, Yang ZQ, Jiao XA. Isolation and Characterization of a Virulent Bacteriophage for Controlling Salmonella Enteritidis Growth in Ready-to-Eat Mixed-Ingredient Salads. J Food Prot 2021; 84:1629-1639. [PMID: 33793776 DOI: 10.4315/jfp-20-460] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 04/01/2021] [Indexed: 12/12/2022]
Abstract
ABSTRACT Ready-to-eat vegetable salads have gained popularity worldwide. However, the microbial safety of these salads is a health concern, primarily due to Salmonella Enteritidis contamination during the growing, harvesting, processing, and handling of produce. In this study, a bacteriophage-based strategy was developed to control Salmonella Enteritidis growth in mixed-ingredient salads. The lytic Salmonella-specific phage SapYZU01 was isolated from a soil sample from a suburban vegetable field in Yangzhou (People's Republic of China). SapYZU01 has a short latent period, a large burst size, and a lytic effect against 13 Salmonella Enteritidis strains isolated from various sources (human samples, pork, deli foods, chickens, and chicken meat). The SapYZU01 genome did not contain virulence or antibiotic resistance genes. SapYZU01 significantly decreased the viability of Salmonella Enteritidis cells in iceberg lettuce, chicken meat, and mixed-ingredient (lettuce plus chicken) salads at 37 and 25°C. Bacterial levels in the salad decreased significantly (by 4.0 log CFU/g) at 25°C after treatment of contaminated lettuce before salad preparation with SapYZU01 at a multiplicity of infection (MOI) of 100. Bacterial levels were decreased by 3.8 log CFU/g at 25°C in lettuce plus chicken salads treated after the salad preparation with SapYZU01 at an MOI of 100. In contrast, treating cooked chicken meat with SapYZU01 at an MOI of 100 before mixing it with contaminated lettuce decreased the bacterial level of the salad by 1.2 log CFU/g at 25°C. These findings indicate the potential application of SapYZU01 as a natural biocontrol agent against Salmonella Enteritidis in mixed-ingredient salads. However, both the treatment method and the bacteriophage MOI must be considered when using this lytic bacteriophage in mixed-ingredient salads. HIGHLIGHTS
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Affiliation(s)
- Wen-Yuan Zhou
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, People's Republic of China
| | - Si-Fan Sun
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, People's Republic of China
| | - Yuan-Song Zhang
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, People's Republic of China
| | - Qin Hu
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, People's Republic of China
| | - Xiang-Feng Zheng
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, People's Republic of China
| | - Zhen-Quan Yang
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, People's Republic of China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, Jiangsu 225001, People's Republic of China
| | - Xin-An Jiao
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, Jiangsu 225001, People's Republic of China
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Translation of the long-term fundamental studies on viral DNA packaging motors into nanotechnology and nanomedicine. SCIENCE CHINA-LIFE SCIENCES 2020; 63:1103-1129. [DOI: 10.1007/s11427-020-1752-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 06/04/2020] [Indexed: 02/07/2023]
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