An interactive map put together by the Wall Street Journal tells you which germs you can find at specific subway stations!!!
http://http://newsfeed.gawker.com/interactive-map-tells-you-exactly-which-germs-are-at-ny-1684092520
http://http://newsfeed.gawker.com/interactive-map-tells-you-exactly-which-germs-are-at-ny-1684092520