Since the discovery of white nose syndrome in the U.S. in the winter of 2006-07, research has been inconclusive that humans play a role in the spread of the fungus that causes white nose syndrome. Through research it is now certain that the primary vector for the spread of the fungus Geomyces destructans is bat to bat, with the secondary vector being from cave to bat. While there has been suspicion of human assistance to the spread of the fungus in instances with long-distance jumps, none have been directly tied to the work of visitors to caves.
http://www.vaildaily.com/article/201109 ... ofile=1062