Read this - the entire thread - if you're still skeptical:

http://flyertalk.com/forum/showthrea...ctious+disease

As did PatrickHenry, I had called the CDC, but got a much more sympathetic reception. The person I spoke with told me that he agreed that an airport check-point floor is ripe for transmitting infection, especially to certain susceptible individuals. However, he basically said the CDC wasn't going to touch this one with a ten foot pole.