An NHS hospital trust has apologised to its patients after it lost nearly 6,000 files containing confidential data about operations and waiting lists.
As a precaution, Bradford Teaching Hospitals NHS Foundation Trust has written to 2,650 surgical patients whose details may have been stored on the USB stick.
It has contacted a further 3,000 other patients who featured in waiting list data also stored on the same device.
Any patients who have not received a letter can be reassured their details were not on the device, the hospital said.
The memory stick was mislaid around 21 April and was reported missing the following day.
Chief executive, Miles Scott, said: ‘On behalf of the Foundation Trust, I would like to apologise to all those patients involved for the anxiety and inconvenience that has been caused.’