“We are not responsible for any mutations that cause your virus-infected laptop to wipe out human civilization after your return to Earth. Unless you land in Berkeley, in which case we’re totally claiming the credit.”

from the BBC: "Nasa has confirmed that laptops carried to the ISS in July were infected with a virus known as Gammima.AG.

"The worm was first detected on Earth in August 2007 and lurks on infected machines waiting to steal login names for popular online games."