The Western Health Trust last night said it is taking "every measure possible" to contain an outbreak of Clostridium Difficile, with five new cases now confirmed at Tyrone County Hospital.
The hospital said that the five patients infected were in Wards Three and Four at the Omagh hospital.
Speaking after an infection control meeting last night, director of Primary Care and Older People's Services with the Trust, Alan Corry-Finn, said: " Since March 12, five patients treated at the hospital have been confirmed as having Clostridium Difficile.
"Three of these patients are currently in hospital and two have been discharged. The three patients are currently being nursed in isolation.
"There is no evidence of these patients having the more virulent form Clostridium Difficile 027 to date" he added.
A further six patients who have had diarrhoea are being cohorted as part of infection control measures.
Tests for Clostridium Difficile on these patients have to date been negative.
Visitors to the hospital have been asked to thoroughly wash their hands before and after visiting.