Here's where the lovely, creative People of the Internet come in. Let's have a collective brainstorm for some sort of personal apparatus that wards off viruses while on planes or trains. I'm not interested in the face masks reminiscent of SARS in China. Either something discreet that others can't see, or perhaps something so freaking outlandish/stylish that it becomes as ubiquitous as the iPod.
Unfortunately, there's no money for R&D, but you'd have my undying gratitude and a far smaller quantity of snotty tissues in the bin.
Suggestions/drawings/whatever in comments or via email.