They found the plastic trays to be the worst.
> Of the surfaces tested, plastic security screening trays appeared to pose the highest potential risk, and handling these is almost inevitable for all embarking passengers.
> Of the surfaces tested, plastic security screening trays appeared to pose the highest potential risk, and handling these is almost inevitable for all embarking passengers.
But maybe it doesn't work the same; or maybe it's just so contaminated it doesn't matter. The best solution[1], though, is probably to sell your soul to the devil and enroll in TSA Precheck.
[1] Presuming there's a real problem. Aren't the fungi that cause atheletes foot (tinea pedis) and onychomycosis (infection of the nail bed) pretty much everywhere already? I think it's more a matter of keeping your [low-temperature] extremities dry. Onychomycosis is almost inevitable past a certain age because of immune and circulatory deficiencies.