MicrobeWorld

"The Lascaux cave in south-west France houses invaluable animal paintings that are between 16,000 and 17,000 years old, making them among the oldest examples of cave art ever found. Now conservationists must deal with the twin threats of the Fusarium solani fungus and the new bacterial populations."

"Researchers have concluded that a benzalkonium chloride spray applied between 2001 and 2004 to kill the original fungus is to blame, as it allowed bacteria brought in by human visitors to thrive."