Experimental Therapeutics Gabrielle Richard, C. Roger MacKenzie, Kevin A. Henry, Evgeny Vinogradov, J. Christopher Hall, Greg Hussack DOI: 10.1128/AAC.02168-19 ABSTRACT Pseudomonas aeruginosa is an opportunistic pathogen that is inherently resistant to many antibiotics and represents an increasing threat due to the emergence of drug-resistant strains. There is a pressing need to develop innovative antimicrobials against this pathogen. In this study, we identified the O-specific antigen (OSA) of P.