Names, dates of birth and salary details of nurses from Sefton PCT have been sent out in error to four external organisations.
The blunder saw the personal details sent to organisations bidding to provide sexual health services for the PCT.
In a move which has increased anger among staff, the trust has refused to provide the names of the organisations involved because of commercial confidentiality surrounding the bidding process.
Kevin Coyne, Unite national officer for health, said: ‘It’s disgraceful that an organisation trusted to protect sensitive medical details of patients can expose their staff in such a dangerous way.’
The PCT, which has launched an investigation and apologised to its 1,800 members of staff, claimed that all of the details received by the organisations have been destroyed.