Antimicrobial Potential of Bacteriophages JG005 and JG024 Against Isolates from Canine Otitis.

Vet Sci

CIISA-Centre for Interdisciplinary Research in Animal Health, Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.

Published: July 2025


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Article Abstract

Canine otitis externa caused by is a relevant disease in veterinary medicine. Given high priority status for the development of new antimicrobials, innovative strategies like bacteriophage therapy are essential. Lytic bacteriophages are viruses with high specificity for their bacterial hosts, making them a promising therapeutic choice in both human and veterinary medicine. This study aimed to evaluate the antimicrobial potential of bacteriophages JG005 and JG024, first characterized in terms of their biofilm-forming ability and antimicrobial susceptibility profile, against isolates obtained from dogs with otitis externa,. Bacteriophages titer, host range, and activity were assessed against biofilms via microtiter assays using crystal violet and Alamar Blue. JG024 showed lytic activity against 61.2% (n = 30/49) of the isolates, while JG005 showed lytic activity against 38.8% (n = 19/49) of the isolates. Crystal violet quantification showed that JG005 can promote strong microbial suppression of 60% (n = 6/10) and 50% (n = 5/10) of the isolates at a multiplicity of infection (MOI) of 10 and 100, respectively. JG024 presented strong microbial suppression of 20% (n = 2/10) of the isolates regardless of the MOI level tested. These phages show promising potential as an innovative treatment for canine otitis externa caused by , but further studies are needed before future clinical use.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12298838PMC
http://dx.doi.org/10.3390/vetsci12070646DOI Listing

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