If you're afraid that doesn't go far enough, you might also post reminders about preventing flu through good hygiene; deck the halls with tissues, hand sanitizer and alcohol wipes; urge sniffly, feverish workers to stay home; and consider sharing electronic files and holding conference calls, instead of passing papers and sneezes around a crowded meeting room.
But rather than making your office look like a haz-mat site, I think it would be more reasonable to don your own protective gear and make extras available to those who want them. Just don't be surprised if you come in to find a flock of inflated rubber-glove turkeys nesting on your desk.
Miller has written for and edited tax publications for 16 years, most recently for the accounting firm KPMG's Washington National Tax office. You can find her on Twitter, @KarlaAtWork.