In the latest DISCOVER magazine one of the lead articles is entitled "The
New Bacteria -- Why Antibiotics Aren't Working Any More".  It deals with
the significant growing problem of antibiotic resistant micoorganisms
including staph, gonorrhea, and tuberculosis, which are due to overuse and
underdosing of antibiotics.

The problem of tolerance and acquired resistance is not limited to
artificial agents:  herbalists often recommend that if you are taking one
of the natural antibacterial products like echinacea or hydrastis or
astralagus, etc., that you vary or rotate the products to avoid the
problem.

Has anyone looked into this problem regarding colloidal silver, i.e. that
bacteria can become resistant or tolerant over time?