Newsflash: If you are a werewolf, silver will kill you. Also, if you are NOT a werewolf, silver will kill you. If you get it inside you, that is. In your bloodstream.
It was previously hoped that nanoparticles of silver could be used to kill harmful bacteria. That’s good. But scientists at the University of Missouri now fear that silver nanoparticles might also kill BENEFICIAL bacteria. That’s not so good. Silver nanoparticles could kill off the bacteria that clean our wastewater. They could accumulate in the soil, and eventually end up in our food. Since it is possible to buy washing machines that emit silver nanoparticles to help kill odor-causing bacteria, and even purchase articles of clothing with silver nanoparticles embedded to help keep down the smell of sweaty armpits.
I’d never heard this thing about nanotech-silver before. Makes you think. If silver on a microscopic level is known to destroy only certain bacteria, might this explain why it is toxic to werewolves? We could argue that werewolfism is caused by a bacterium; that would explain why silver is the go-to means for killing one. I seem to recall this trope used before in fiction, that silver reacts with a werewolf’s physiology on a microscopic level, disrupting basic cellular function.