Waikato District Health Board has confirmed that the origin of a computer virus that crashed its system for three days, causing major disruption, was a USB stick.
The Conficker virus shut down the board's 3000 computers in December, although its hospitals were able to continue functioning.
The board says the system was infected by the virus entering via a data stick and staff have been instructed not to use them.
It says a report into the computer failure will be released in the next fortnight.
