NP108, an Antimicrobial Polymer with Activity against Methicillin- and Mupirocin-Resistant Staphylococcus aureus

Derry K. Mercer, Laura K. Katvars, Fiona Hewitt, Daniel W. Smith, Jennifer Robertson, Carol A. Munro, Deborah A. O'Neil

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12 Citations (Scopus)
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Staphylococcus aureusis a clinically significant human pathogen that causes infectious diseases ranging from skin and soft tissue infections (SSTI) and health care-associated infections (HAI) to potentially fatal bacteremia and endocarditis. Nasal carriage ofS. aureus, especially for persistent carriage, is associated with an increased risk of subsequent infection, particularly nosocomial and surgical site infections (SSI), usually via autoinfection. NP108 is a cationic antimicrobial polymer composed of generally recognized as safe (GRAS) amino acid building blocks. NP108 is broad spectrum and rapidly bactericidal (3-log kill in ≤3 h), killing bacteria by membrane disruption and cell lysis. NP108, contrary to many antibiotics, shows equally effective antimicrobial activity against a variety o fS. aureus(MIC100= 8 to 500 mg/liter) and S. epidermidis (MIC100= 4 to 8 mg/liter) isolates, whether exponentially growing or in stationary phase. NP108 is antimicrobially active under nutrient-limiting conditions similar to those found in the anterior nares (MIC100= 8 mg/liter) and kills antibiotic-resilient small colony variants (MIC100= 32 mg/liter) andS. aureusbiofilms (prevention, MIC100= 1 to 4 mg/liter; eradication, MIC100≥ 31.25 mg/liter). NP108 is active against isolates of S. aureusresistant to the current standard-of-care decolonization agent, mupirocin, with no significant increase in the MIC100NP108 is water soluble and has been formulated into compatible aqueous gel vehicles for human use in which antimicrobial efficacy is retained (2.0% [wt/vol]). NP108 is a potential nonantibiotic antimicrobial alternative to antibiotics for the nasal decolonization ofS. aureus, with clear advantages in its mechanism of action over the existing gold standard, mupirocin.

Original languageEnglish
Article numbere00502-17
Pages (from-to)1-13
Number of pages13
JournalAntimicrobial Agents and Chemotherapy
Issue number9
Early online date12 Jun 2017
Publication statusPublished - Sep 2017


  • Journal Article
  • antimicrobial activity
  • nasal decolonization
  • Staphylococcus aureus


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