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17 October 2011, 15:18
17 people are now believed to have been affected by contaminated saline at Stepping Hill Hospital in Stockport.
Following the release of nurse Rebecca Leighton last month, Greater Manchester Police said they were looking at around 42 potential victims.
Detectives and medical experts have now concluded 17 people were poisoned, 16 other cases have been eliminated from the inquiry and 10 others are still being investigated.
Amongst the 17 confirmed poisoned, 3 people died.
Nurse Miss Leighton spent more than six weeks in custody but was freed in September after the case against her was dropped.
Heightened security measures remain in place at Stepping Hill.
No-one is allowed to administer intravenous drips alone and all keys to medicine cabinets have to be signed for.