Figures suggest around 900 staff at Derby and Burton hospitals have not had the Covid vaccine for undisclosed or non-health reasons, APA reports quoting BBC.
Jabs have been available to all 15,862 front-line staff at the the Royal Derby Hospital and Queen's Hospital in Burton for four months.
Figures show 1,587 staff have not yet had their vaccines.
Of these, 687 have said they are delaying the jab, mostly for health reasons such as pregnancy.
Another 68 have declined outright for non-health reasons, which have not been specified.
The remaining 832 have so far not explained why they have not come forward.
The trust has confirmed staff who have declined vaccines are still in work and reiterate that the jabs are not mandatory.