Centre for Health Protection controller Thomas Tsang Ho-fai said four water samples taken from the toilet tested positive for the Legionella bacteria.
Tsang said the findings are preliminary and that final results are expected in about two weeks.
Confirmation that Legionella bacteria was found on the 11th floor adds to the problems experienced by the new SAR government headquarters' East Wing, which include cost overruns, behind- schedule construction and complaints by users of substandard interior work.
Tsang tried to ease the fears of other users of the building by emphasizing that the center has not received any new reports of legionnaires' disease.
The bacteria was not found in water or other samples taken from Suen's home, Tsang added.
The center has suggested installing special water filters and antiseptic dispensers in the new government headquarters. As a precautionary step, the center and the departments of electrical and mechanical services, water supplies and architectural services have collected more water samples from the building for further tests.
" The center has advised the building management on appropriate follow-up actions, including disinfection and risk- mitigation measures," He was admitted to Queen Mary Hospital on December 19 after contracting pneumonia.
Suen was in intensive care for a few days but his condition is now stable. His leave has been extended to January 3.Ho Pak-leung, director of microbiology at the University of Hong Kong, said it is "rather bad" for Legionella to be found in a new building.
"It's supposed to be a modern building. It's not good to find the bacteria here, as it is usually found in old buildings with poor maintenance," Ho said. "The building's design may be a reason."
Ho said the water supply system should be checked to see whether it is the source of infection.
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