Traces of Legionella bacteria have been found in showers on a children's ward at Nottingham's Queen's Medical Centre.
Hospital officials have stopped the showers being used, but the ward - E17 - has not been closed.
The bacteria were found in water from the showers when routine testing was being carried out. The ward currently has nine young patients.
A hospital spokesman said patient safety was the trust's priority and would not be compromised.
'Precautionary measures'
The children on the affected ward will be using other shower facilities for the time being.
Jonathan Evans, Clinical Director of Family Health, said affected units would be replaced.
"This is a short term problem, which thanks to our precautionary measures and prompt action has not resulted in any illness to date and the remedial work will be completed next week.
"We apologise for any inconvenience to patients and families on the ward and thank them for their patience," he said.
The bacteria can cause Legionnaires' disease, a rare form of pneumonia, most often contracted by inhaling mist from water sources.
It cannot be passed from one person to another.
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