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Open AccessArticle

Polyvalent Phage CoNShP-3 as a Natural Antimicrobial Agent Showing Lytic and Antibiofilm Activities against Antibiotic-Resistant Coagulase-Negative Staphylococci Strains

1
Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Nasr City, 11884 Cairo, Egypt
2
Microbiology and Immunology Department, Faculty of Medicine (Girls), Al-Azhar University, Nasr City, 11884 Cairo, Egypt
*
Authors to whom correspondence should be addressed.
Foods 2020, 9(5), 673; https://doi.org/10.3390/foods9050673
Received: 20 April 2020 / Revised: 18 May 2020 / Accepted: 19 May 2020 / Published: 23 May 2020
Synthetic antimicrobials have a negative impact on food quality and consumer health, which is why natural antimicrobials are urgently needed. Coagulase-negative staphylococci (CoNS) has gained considerable importance for food poisoning and infection in humans and animals, particularly in biofilms. As a result, this study was conducted to control the CoNS isolated from food samples in Egypt. CoNS isolates were selected on the basis of their antibiotic susceptibility profiles and their biofilm-associated behavior. In this context, a total of 29 different bacteriophages were isolated and, in particular, lytic phages (6 isolates) were selected. The host range and physiological parameters of the lytic phages have been studied. Electron microscopy images showed that lytic phages were members of the families Myoviridae (CoNShP-1, CoNShP-3, and CoNSeP-2 isolates) and Siphoviridae (CoNShP-2, CoNSsP-1, and CoNSeP-1 isolates). CoNShP-1, CoNShP-2, and CoNShP-3 were found to be virulent to Staphylococcus haemolyticus, CoNSsP-1 to Staphylococcus saprophyticus and CoNSeP-1 and CoNSeP-2 to Staphylococcus epidermidis. Interestingly, the CoNShP-3 exhibited a typical polyvalent behavior, where not only lysis CoNS, but also other genera include Staphylococcus aureus, methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Staphylococcus aureus (VRSA), Bacillus cereus and Bacillus subtilis. In addition, CoNShP-3 phage showed high stability at different temperatures and pH levels. Indeed, CoNShP-3 phage showed an antibiofilm effect against Staphylococcus epidermidis CFS79 and Staphylococcus haemolyticus CFS43, respectively, while Staphylococcus saprophyticus CFS28 biofilm was completely removed. Finally, CoNShP-3 phage demonstrated a high preservative efficacy over short and long periods of storage against inoculated CoNS in chicken breast sections. In conclusion, this study highlights the control of CoNS pathogens using a polyvalent lytic phage as a natural antibacterial and antibiofilm agent from a food safety perspective. View Full-Text
Keywords: natural antimicrobials; food safety; bacteriophages; CoNShP-3; phage biocontrol; foodborne bacteria; coagulase-negative Staphylococcus; CoNS; antibiotic-resistance; antibiofilm activity natural antimicrobials; food safety; bacteriophages; CoNShP-3; phage biocontrol; foodborne bacteria; coagulase-negative Staphylococcus; CoNS; antibiotic-resistance; antibiofilm activity
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MDPI and ACS Style

Sofy, A.R.; Abd El Haliem, N.F.; Refaey, E.E.; Hmed, A.A. Polyvalent Phage CoNShP-3 as a Natural Antimicrobial Agent Showing Lytic and Antibiofilm Activities against Antibiotic-Resistant Coagulase-Negative Staphylococci Strains. Foods 2020, 9, 673.

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