Affiliation:
1. Department Biological Safety, German Federal Institute for Risk Assessment, 10589 Berlin, Germany
2. Phage Technology Center GmbH, 59199 Boenen, Germany
3. Department for Biometry, Epidemiology and Information Processing, University of Veterinary Medicine Hannover, Foundation, 30559 Hannover, Germany
Abstract
Salmonella are important pathogenic bacteria and, following Campylobacter, they are the second most common cause of bacterial foodborne infections worldwide. To reduce the presence of bacteria along the food chain, the application of bacteriophages (phages) may be a promising tool. In this study, the lytic properties of six phages against five relevant Salmonella serotypes (S. Enteritidis, S. Typhimurium, S. Infantis, S. Paratyphi B and S. Indiana) were analyzed. Three phages were able to lyse all five serotypes. We determined the lytic potential of each phage on indicator strains in vitro at room temperature (RT) and at 37 °C using low multiplicities of infection (MOIs). Most phages reduced their host more efficiently at RT than at 37 °C, even at the lowest MOI of 0.001. Following this, the lytic activity of a cocktail comprising five phages (MOI = 0.1) was examined with each of the five serotypes and a mix of them at RT, 15, 12, 10, 8 and 6 °C. All cultures of single serotypes as well as the mixture of strains were significantly reduced at temperatures as low as 8 °C. For single serotypes, reductions of up to 5 log10 units and up to 2.3 log10 units were determined after 6 h (RT) and 40 h (8 °C), respectively. The mixture of strains was reduced by 1.7 log10 units at 8 °C. The data clearly suggest that these phages are suitable candidates for biocontrol of various Salmonella serotypes under food manufacturing conditions.
Funder
German Federal Ministry of Food and Agriculture
German Federal Office for Agriculture and Food
Subject
Virology,Microbiology (medical),Microbiology
Reference68 articles.
1. Schaechter, M. (2009). Encyclopedia of Microbiology, Academic Press. [3rd ed.].
2. The global burden of nontyphoidal Salmonella gastroenteritis;Majowicz;Clin. Infect. Dis.,2010
3. World Health Organization (2015). WHO Estimates of the Global Burden of Foodborne Diseases: Foodborne Disease Burden Epidemiology Reference Group 2007–2015, World Health Organization.
4. Ehuwa, O., Jaiswal, A.K., and Jaiswal, S. (2021). Salmonella, Food Safety and Food Handling Practices. Foods, 10.
5. Worldwide Epidemiology of Salmonella Serovars in Animal-Based Foods: A Meta-analysis;Ferrari;Appl. Environ. Microbiol.,2019