PolyMedix Inc., of Radnor, Pa., presented clinical and preclinical data that showed its defensin-mimetic antibiotic, PMX-30063, may be active against Gram-positive and certain evaluated Gram-negative organisms, including multidrug-resistant species. In a Phase I trial, PMX-30063 also demonstrated antimicrobial activity in human blood plasma against both resistant and susceptible strains of Staphylococcus aureus.