Oral Presentation 12th Australasian Virology Society Meeting 2024

Ethical bioprospecting for phages across Australian landscapes. (#49)

Trevor Lithgow 1
  1. Biomedicine Discovery Institute and Department of Microbiology, Monash University, Melbourne, VIC, Australia

Antimicrobial resistance (AMR) is of growing concern, with AMR strains from livestock and humans potentially spilling over into our waterways. In Australia, information regarding environmental AMR characteristics of Klebsiella and other pathogens of interest is limited, with a focus on this knowledge gap increasing in urgency to facilitate efforts to track and control the spread of environmentally acquired infections. Bacteriophages are found in the same niches as their prey, including waterway environments. Water samples thus provide a potential untapped source of environmental AMR-targeting viruses, washed in from diverse terrestrial ecotypes. We are working to isolate bacteriophages (phages) from country in Victoria, New South Wales and Western Australia. In our studies in partnership with the Traditional Owners of Melbourne’s two large rivers, Maribyrnong and Birrarung (the Yarra), water samples were collected and processed using selective agar to isolate environmental strains of bacteria. These strains were then used to isolate phage from the same water samples. Our work on the structure and functional interactions made by some of these new phages will be presented, including two new minimalist phages isolated on distinct Klebsiella hosts. The minimalist phages are simpler than the more classic phage counterparts, thus providing for experimental studies to better understand how phage-host interactions are mediated. Current work on single-particle cryo EM assessments of these phages will also be discussed.