Abstract
Avian pathogenic Escherichia coli (APEC) is the causative agent of avian colibacillosis, which causes significant economic losses to the poultry industry. The growing resistance of bacteria to antibiotics is a major global public health concern. However, there is limited data on the efficacy of phage therapy in effectively controlling and treating APEC infections. In this study, a novel lytic Escherichia phage, vB_EcoS_PJ16, was isolated from poultry farm wastewater and characterized in both in vitro and in vivo conditions. Transmission electron microscopy analysis revealed the presence of an icosahedral head and a long non-contractile tail, classifying the phage under the Caudoviricetes class. Host range determination showed that Escherichia phage vB_EcoS_PJ16 exhibited lytic activity against multiple strains of pathogenic E. coli, while no significant signs of lysis for Klebsiella pneumoniae, Salmonella Typhimurium, Listeria monocytogenes, and Staphylococcus aureus. Biophysical characterization revealed that the isolated phage was sturdy, as it remained viable for up to 300 days at temperatures of 30 °C, 37 °C, and 42 °C and for up to 24 h at pH 5 to 11, with only minor changes in titer. Kinetic analysis at multiplicity of infection (MOI) 0.1 showed a latency period of about 20 min and a burst size of 26.5 phage particles per infected cell for phage vB_EcoS_PJ16. Whole genome sequencing unveiled that the phage vB_EcoS_PJ16 genome consists of a double-stranded linear DNA molecule with 57,756 bp and a GC content of 43.58%. The Escherichia phage vB_EcoS_PJ16 genome consisted of 98 predicted putative ORFs, with no transfer RNA identified in the genome. Among these 98 genes, 34 genes were predicted to have known functions. A significant reduction in APEC viability was observed at MOI 100 during in vitro bacterial challenge tests conducted at different MOIs (0.01, 1, and 100). In vivo oral evaluation of the isolated phage to limit E. coli infections in day-old chicks indicated a decrease in mortality within both the therapeutic (20%) and prophylactic (30%) groups, when compared to the control group. The findings of this study contribute to our current knowledge of Escherichia phages and suggest a potentially effective role of phages in the therapeutic and prophylactic control of antibiotic-resistant APEC strains.
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Data availability
All data generated or analyzed during this study are included in this article. The complete genome sequence of novel Escherichia phage vB_EcoS_PJ16 is available in NCBI GenBank with accession number OQ955832.
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This work was supported by the funds provided by the Indian Council of Agricultural Research under the project Outreach Programme on Zoonotic Diseases with file/grant number AS/1/1/12017-ASR-IV.
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All authors contributed to the study conception and design. Conceptualization: Punit Jhandai and Dinesh Mittal; methodology: Punit Jhandai; investigation: Punit Jhandai; resources: Dinesh Mittal and Rajesh Khurana; data curation: Renu Gupta; writing and preparation of original draft: Punit Jhandai; review and supervision: Dinesh Mittal, Renu Gupta, Manesh Kumar, and Rajesh Khurana. All authors have read and approved the final manuscript.
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Jhandai, P., Mittal, D., Gupta, R. et al. Therapeutics and prophylactic efficacy of novel lytic Escherichia phage vB_EcoS_PJ16 against multidrug-resistant avian pathogenic E. coli using in vivo study. Int Microbiol 27, 673–687 (2024). https://doi.org/10.1007/s10123-023-00420-7
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DOI: https://doi.org/10.1007/s10123-023-00420-7