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Updated: Jul 9, 2026

T4 Bacteriophage and E. coli Interaction in the Murine Intestine: A Prototypical Model for Studying Host-Bacteriophage Dynamics In Vivo
Published on: January 26, 2024
Isolation and characterization of a novel Enterococcus faecalis bacteriophage phiEF24C as a therapeutic candidate
Abstract:
Vancomycin-resistant Enterococcus faecalis (VRE) has become a significant threat in nosocomial settings. Bacteriophage (phage) therapy is frequently proposed as a potential alternative therapy for infections caused by this bacterium. To search for candidate therapeutic phages against Enterococcus faecalis infections, 30 Enterococcus faecalis phages were isolated from the environment. One of these, virulent phage phiEF24C, which has a broad host range, was selected for analysis. The plaque-forming ability of phiEF24C was virtually unaffected by differences in the clinical host strains. Furthermore, the phage had a shorter latent period and a larger burst size than ordinary tailed phages, indicating that phiEF24C has effective lytic activity against many Enterococcus faecalis strains, including VRE. Morphological and genomic analyses revealed that phiEF24C is a large myovirus (classified as family Myoviridae morphotype A1) with a linear double-stranded DNA genome of c. 143 kbp. Analyses of the N-terminal amino acid sequences of the virion proteins, together with the morphology and the genome size, speculated that phiEF24C is closely related to other myoviruses of Gram-positive bacteria that have been used experimentally or practically for therapy or prophylaxis. Considering these results, phiEF24C may be a potential candidate therapeutic phage against Enterococcus faecalis infections.
Insights
Bacteriophage phiEF24C shows promise as a novel therapy against Vancomycin-resistant Enterococcus faecalis (VRE) infections. This virulent phage effectively lyses VRE strains, offering a potential alternative to antibiotics.
Area of Science:
- Microbiology
- Virology
- Infectious Diseases
Background:
- Nosocomial infections caused by Vancomycin-resistant Enterococcus faecalis (VRE) are a growing public health concern.
- Bacteriophage (phage) therapy is being explored as a viable alternative to conventional antibiotics for treating VRE infections.
Discussion:
- Phage phiEF24C, isolated from the environment, demonstrated broad host range and effective lytic activity against diverse Enterococcus faecalis strains, including VRE.
- phiEF24C exhibits a shorter latent period and larger burst size compared to typical tailed phages, indicating potent lytic capabilities.
- Morphological and genomic analyses classify phiEF24C as a large myovirus (Myoviridae, morphotype A1) with a 143 kbp double-stranded DNA genome.
Key Insights:
- The plaque-forming ability of phiEF24C is largely independent of Enterococcus faecalis clinical host strain variations.
- phiEF24C's characteristics suggest a close evolutionary relationship with other therapeutic myoviruses targeting Gram-positive bacteria.
- The phage's efficient lytic activity and broad host range make it a strong candidate for VRE infection treatment.
Outlook:
- Further research into phiEF24C's efficacy and safety profile is warranted for its clinical application.
- phiEF24C represents a promising phage candidate for developing novel therapeutic strategies against VRE infections.
- The study highlights the potential of environmental phage isolation for discovering new antimicrobial agents.
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