Actually, silver has been shown to kill viruses

I disagree.  I believe that there is ample evidence that silver nanoparticles do in fact kill viruses as well as prevent them from multiplying.  To cite just a few examples:

*In a 2005 study, scientists tested three different silver nanoparticle preparations in vitro against cultured HIV-1 cells.  After only 3 hours, 0% of the cells were living.

*In the book "Use of Colloids in Health and Disease", author Dr. Henry Crooks stated that colloidal silver is highly anti-viral.  In laboratory tests he found that "all fungus, virii, bacterium, streptococcus, staphylococcus, and other pathogenic organisms are killed in three or four minutes".

*In 2010, scientists found that silver nanoparticles were able to destroy viruses such as those responsible for the common cold.

*Colloidal silver has also been used very effectively to kill canine parvo - one can find numerous testimonials, including here at CureZone, and I personally know of kennels who eliminated recurring parvo outbreaks by simply adding colloidal silver to the dogs drinking water.