In hospital water systems legionellae may be resistant to disinfectants in pipework, which is a problem particularly in areas where there is low flow or stagnation of water. We evaluated legionella colonization of a water network of an Italian hospital after time flow taps (TFTs) installation in proximity to dead legs. The water volume flushed was 64 L/day from May 2016, and 192 L/day from December 2016. Before TFTs installation, Legionella pneumophila sg2-14 was detected in all points (4 × 10(4) ± 3.1 × 10(4) cfu/L). All sites remained positive (2.9 × 10(4) ± 1.9 × 10(4) cfu/L) through November 2016. From December 2016 legionella persisted in one point only (2 × 10(2) to 6.8 × 10(3) cfu/L). TFTs with chemical disinfection may reduce legionella colonization associated with dead legs.

Rate of Legionella pneumophila colonization in hospital hot water network after time flow taps installation

VALENTINI, PAOLA;CASINI, BEATRICE;BAGGIANI, ANGELO
2017

Abstract

In hospital water systems legionellae may be resistant to disinfectants in pipework, which is a problem particularly in areas where there is low flow or stagnation of water. We evaluated legionella colonization of a water network of an Italian hospital after time flow taps (TFTs) installation in proximity to dead legs. The water volume flushed was 64 L/day from May 2016, and 192 L/day from December 2016. Before TFTs installation, Legionella pneumophila sg2-14 was detected in all points (4 × 10(4) ± 3.1 × 10(4) cfu/L). All sites remained positive (2.9 × 10(4) ± 1.9 × 10(4) cfu/L) through November 2016. From December 2016 legionella persisted in one point only (2 × 10(2) to 6.8 × 10(3) cfu/L). TFTs with chemical disinfection may reduce legionella colonization associated with dead legs.
Totaro, M; Valentini, Paola; Costa, A. L; Giorgi, S; Casini, Beatrice; Baggiani, Angelo
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/876707
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