Theoretically there would be viral particles in your shoes. However, as I point out to my patients, at what point do you think you have ceased shedding wart particles? Whatif you have brand new shoes or shoes that cost alot?
As far as that is concerned-what about bathtubs, carpet, beds? You see what a mess this can become?
I wish I had a scientific answer as I get asked this all the time. I know of no reliable way to determine the correct answer.