In our hospital,
Legionella monitoring in the shower water of bathrooms is conducted every year.
Legionella was detected in only one of the sink taps of the fifth floor psychiatric ward bathroom in 2010, but
Legionella was also detected in several showers and sink taps of the fourth floor obstetrics and gynecology ward, Maternity and Perinatal Care Center, and NICU in 2011. Furthermore,
L. pneumophila serogroup 1 was detected in several components of the water system equipment except for bathrooms. Hoses were exchanged and water drained to eradicate
Legionella, and rechecking was negative in all locations except the sink of the interview room in the Maternity and Perinatal Care Center. According to interviews with nurses, water drainage was not fully performed. We considered the departmental cooperative activities supporting the system of
Legionella infection control in the hospital, and the arrangement and use of water system equipment at this time. We thought that the risk of
Legionella becomes high with low frequency in use of water system equipment, because the infection center was on the fourth floor that is the bottom of the arrangement of water system equipment, and infection spread mostly from water system equipment with low frequency use in that location. The arrangement of a water supply system must be carefully examined, and the frequency of use of water system equipment monitored as part of measures against
Legionella. For this reason, prompt cooperation between the infection control committee, responsible staff, and the equipment division, and information exchange are essential. We propose a guidance plan to ensure cooperation and exchange of information.
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