{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T01:22:14Z","timestamp":1784164934530,"version":"3.55.0"},"reference-count":71,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2021,1,25]],"date-time":"2021-01-25T00:00:00Z","timestamp":1611532800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Microbiol."],"abstract":"<jats:p><jats:italic>Citrobacter<\/jats:italic>species often occur in sewage, food, soil, wastewater, and in the intestinal tract of animals and humans.<jats:italic>Citrobacter<\/jats:italic>spp. cause urinary tract infections (UTIs) and infantile meningitis in humans. Due to the presence of plasmid-encoded resistance genes,<jats:italic>Citrobacter<\/jats:italic>spp. are often resistant to many antibiotics. In this study,<jats:italic>Citrobacter<\/jats:italic>virus HCF1, a novel virulent bacteriophage capable of killing<jats:italic>Citrobacter amalonaticus<\/jats:italic>and<jats:italic>Citrobacter freundii<\/jats:italic>, was isolated from the sewage water. The isolated bacteriophage was characterized with respect to transmission electron microscopy, one-step growth curve, host range,<jats:italic>in vitro<\/jats:italic>efficacy, storage stability, and environmental stress tolerance. The one-step growth curve analysis revealed that the latent period of HCF1 was 30 min and the estimated burst size was 121 plaque-forming units (PFU) per bacterial cell. Host range testing indicated that the HCF1 was specific to the<jats:italic>Citrobacter<\/jats:italic>genus.<jats:italic>In vitro<\/jats:italic>efficacy assay in the effluent of an anaerobic biodigester showed that the HCF1 completely eliminated the host within 4 and 5 h at MOI:100 and MOI:10, respectively, thereby indicating its potential for combating<jats:italic>C. amalonaticus<\/jats:italic>infections. The isolated bacteriophage is considerably stable and tolerant to environmental stress. Furthermore, the complete genome of HCF1 was sequenced using Oxford Nanopore sequencing and the data were subjected to detailed bioinformatic analyses. NCBI-BLASTn analysis revealed that the HCF1 genome had a query coverage of 15\u201321% and a maximum similarity of 77.27\u201378.49% with 11 bacteriophages of the<jats:italic>Drexlerviridae<\/jats:italic>family. Detailed bioinformatic analysis of the genome profile suggests that HCF1 is a novel<jats:italic>T1svirus<\/jats:italic>belonging to the<jats:italic>Tempevirinae<\/jats:italic>subfamily of the<jats:italic>Drexlerviridae<\/jats:italic>family.<\/jats:p>","DOI":"10.3389\/fmicb.2021.644013","type":"journal-article","created":{"date-parts":[[2021,1,25]],"date-time":"2021-01-25T04:42:51Z","timestamp":1611549771000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":13,"title":["Phenotypic Characterization and Whole-Genome Analysis of a Novel Bacteriophage HCF1 Infecting Citrobacter amalonaticus and C. freundii"],"prefix":"10.3389","volume":"12","author":[{"given":"Prince","family":"Kumar","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mukesh K.","family":"Meghvansi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dev V.","family":"Kamboj","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2021,1,25]]},"reference":[{"key":"B1","first-page":"35","article-title":"Long-term bacteriophage preservation.","volume":"38","author":"Ackermann","year":"2004","journal-title":"World Fed. 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