Servers at the UK's Leeds Primary Care NHS Trust were recently attacked by the Conficker worm.

"The malware infection struck on Friday and forced administrators to take a handful of infected servers offline, in phases, in order to apply deworming tools," writes The Register's John Leyden. "Trust PCs were not infected by the attack, which a leaked memo... blamed on the connection of an infected laptop onto the network."

"Conficker was first detected in November 2008," Leyden notes. "Initially the worm spread using a Microsoft Windows vulnerability but other tricks in its armory, in particular its ability to spread from infected USB sticks, have become its main route for infection."

Click here to read the article at The Register.