16. A pharmaceutical composition for treatment of a microbial infection comprising daptomycin in an amount that is not effective
by itself to treat the microbial infection, and a potentiating amount of a silver-containing compound, with a pharmaceutically
acceptable carrier, wherein the potentiating amount of the silver-containing compound is sufficient to expand the spectrum
of daptomycin, but is below a threshold level required to effectively treat the microbial infection when used alone.