Some might ask why the carparking booth had access to the internal network at all or appeared to not be partitioned outside the "core network"

http://www.stuff.co.nz/waikato-times/news/3434167/Health-chaos-blame-a-stick

A USB data stick inserted into a computer at a Waikato Hospital carpark booth is being blamed for disabling the entire Waikato District Health Board computer network in December.

Wilson Parking northern general manager Stephan Wuffli confirmed the source of the destructive Conficker virus yesterday despite attempts by the Waikato DHB to withhold the information until "correct procedures had been followed".

"Our understanding is that the virus most probably originated via a USB (universal serial bus) stick that was inserted into a computer in the carpark booth," Mr Wuffli said.

The virus brought to a standstill the DHB's 3000- strong computer network across the Waikato for at least three days, causing mayhem for 5600 staff and their patients.

The carpark booth was linked to the DHB network, according to Mr Wuffli, who said the booth housed both carpark and DHB computers.