Yes, probably the biggest spreaders are the chair backs and seat and the menus in the main dining room. How do you wash your hands after you pull your chair in? Hand sanitizer does not kill Norovirus. It will kill Covid, but not Noro. Masks are not effective in preventing any virus. Virus particles are too small, plus when a person removes the mask to place it somewhere, the exterior of the mask is usually touched so the person now has any bacteria or germ that the mask "caught" on their hands.