As far as I am concerned, it is pretty hard for bacteria or virus to survive on a steel blade. It would be like being on a desolated desert with no water at hand: you would not live that long. Many bacteria and viruses cannot survive long outside a "biological" creature or away from an organic material.
Despite of this, it is of course wise and good to clean and disinfect a vintage razor. I personally have more than one hundred and always followed a quite simple cleaning and disinfecting processing. Nothing bad happened so far. Finger crossed, of course!