Three Polish doctors and six nurses are facing criminal prosecution after a number of homeless people died following medical trials for a vaccine to the H5N1 bird-flu virus.
Authorities claim that the alleged victims received £1-2 to be tested with what they thought was a conventional flu vaccine but, according to investigators, was actually an anti bird-flu drug.
The news of the investigation will come as another blow to the reputation of Poland's beleaguered and poverty-stricken national health service. In 2002, a number of ambulance medics were found guilty of killing their patients for commissions from funeral companies.