A cancer chemotherapy patient has to have her intravenous port revised after it becomes blocked and the catheter is found to contain bacterial contaminants. Which of the following attributes is most likely to be a factor in this pathogenesis?

  •  Biofilm production
  •   Ergosterol containing membrane
  •   Peptidoglycan layer
  •  Possession of pili
  •  Possession of IgA protease