MHIV or hepatitis over the past six years.
Official figures reveal "unacceptable" picture of widespread failures to need of needles, resulting in pay-outs of at least £ 4,077,441 since 2012.
Hospitals are safe, usually by means of a solid, brightly marked "sharps" bin, which doctors and nurses should ensure are close at hand before administering injections.
However, data from NHS Resolution, there were 1,833 claims for so-called needlestick injuries between 2012 and 2017.
Of the 1,212 successful claimants, three-quarters were ancillary workers as well as porters, cleaners and maintenance staff.
Once accidentally pricked by a used needle, they are contracted a blood-borne disease.
On Saturday workers' representatives said they are not living in a critical situation.
The NHS Resolution was said to be dangerous, or failing to use them at all, were common reasons for "avoidable" injuries.
The amount of money paid out in compensation since 2012 could not be more than 200 years for a year. Claims were made both on the basis of physical injury and psychological distress.
Sara Gorton, head of health at Unison, said: "It's completely unacceptable for staff when they're just trying to do their job.
"Search injuries cause unnecessary stress and can have a huge impact on someone's health. This means time off and ultimately has an effect on patients' treatment.
"Training needs to get better and trust must enforce safety."
Injury to one's blood is a major contributor to the disease, and one in three for hepatitis B, one in 30 for hepatitis C and one in 300 for HIV.
As well as support workers, medical staff can therefore be at risk and accounted for 11 per cent of the successful claims for compensation between 2012 and 2017.
Surgeons face the particular danger of accidentally stabbing themselves with an infected needle or sharp instrument while operating.