The Register has reported that it cost Ealing Council, in London (UK) some £500,000 in lost revenue and repairs after a "virus infection" in May. According to El Reg’s John Leyden, the virus in question was Conficker-D, though because of differences in Conficker variant naming, it’s difficult to say exactly which variant that would refer to. Not that it matters very much at this point, I suppose.
According to the Guardian further costs to the Council include:
The cause of the infection has been traced back to a council employee who plugged an infected USB memory stick of some kind into a PC at work.
Now do you believe us when we tell you that you need to install the Microsoft patches that will stop Autorun executing from most USB devices?
David Harley BA CISSP FBCS CITP
Director of Malware Intelligence
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Author David Harley, ESET