Hi Yo, Silver!

Last year the TV show Innovation Nation highlighted an inventor who had produced a shirt that never stinks. The way it worked was that there were silver threads woven in with the cloth. Silver kills bacteria, they explained, and body odor is caused by bacteria.
I didn’t know that about silver, and they never explained why or how silver kills bacteria. I was informed that copper and bronze are even better at killing both bacteria and viruses. Wikipedia has a very good article explaining how these metals kill pathogens.
This made me wonder why all door and faucet handles, light switches, hand rails, and all sorts of other places that spread germs in hospitals aren’t silver or copper plated?