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Dedrick, Rebekah M; Smith, Bailey E; Garlena, Rebecca A; Russell, Daniel A; Aull, Haley G; Mahalingam, Vaishnavi; Divens, Ashley M; Guerrero-Bustamante, Carlos A; Zack, Kira M; Abad, Lawrence; Gauthier, Christian H; Jacobs-Sera, Deborah; Hatfull, Graham F
MBio, 03/2021, Letnik: 12, Številka: 2Journal Article
is an opportunistic pathogen whose treatment is confounded by widespread multidrug resistance. The therapeutic use of bacteriophages against infections offers a potential alternative approach, although the spectrum of phage susceptibilities among isolates is not known. We determined the phage infection profiles of 82 recent clinical isolates and find that colony morphotype-rough or smooth-is a key indicator of phage susceptibility. None of the smooth strains are efficiently killed by any phages, whereas 80% of rough strains are infected and efficiently killed by at least one phage. The repertoire of phages available for potential therapy of rough morphotype infections includes those with relatively broad host ranges, host range mutants of phages, and lytically propagated viruses derived from integrated prophages. The rough colony morphotype results from indels in the glycopeptidolipid synthesis genes and , negating reversion to smooth as a common route to phage resistance. Resistance is thus rare, and although mutations in polyketide synthesis, , and can confer resistance, these likely also impair survival The expanded therapeutic repertoire and the resistance profiles show that small cocktails or single phages could be suitable for controlling infections with rough strains. infections in cystic fibrosis patients are challenging to treat due to widespread antibiotic resistance. The therapeutic use of lytic bacteriophages presents a new potential strategy, but the great variation among clinical isolates demands determination of phage susceptibility prior to therapy. Elucidation of the variation in phage infection and factors determining it, expansion of the suite of therapeutic phage candidates, and a greater understanding of phage resistance mechanisms substantially advances the potential for broad implementation of new therapeutic options for infections.
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