Silver is anti microbial; eating on silver may well be very beneficial.

Harmful microbes being on our plates rather than within the food we eat is not a common vector of disease, unless you tend to reuse your plates without washing them in between.

In the latter case, there's a much less expensive option available to improve your health instead of buying silver plates...

Copper has the same effect.

Brass tableware would be the least expensive material for this purpose.

https://en.m.wikipedia.org/wiki/Oligodynamic_effect

Not all bacteria are harmful. Most of us would probably be better off consuming a wider variety of it.

It is however an absolute pain to keep clean.