American journal of infection control · 2010
A preliminary assessment of the occupational risk of acquiring Legionnaires' disease for people working in telephone manholes, a new workplace environment for Legionella growth.
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Ricci Maria Luisa, Fontana Stefano, Bella Antonino, Gaggioli A, Cascella R, Cassone Antonio, Scaturro Maria, Microbiologists of the Regional Agency for Environmental Protection of Novara
Аннотация
BACKGROUND: Telephone manholes (TMs) are underground wells, used in Italy by the telecommunication companies to locate telephone networks. Following a fatal case of Legionnaires' disease (LD), acquired during working activity in a TM, we investigated whether Legionella was present in TMs and could be a risk for manhole workers (MWs).
METHODS: Three hundred fifty-three environmental samples were collected from 100 TMs, and serum antibody titer against Legionella pneumophila and Legionella species non-pneumophila was determined from both MWs and control non-manhole workers.
RESULTS: L pneumophila and Legionella species non-pneumophila were detected in 28% of water samples, in 8% of the biofilm, and in 6% of sediment matrices taken in TMs, in a concentration range of 10(2) to 10(4) colony-forming units/L. No Legionella was found in TM air samples. Although there was a statistically significant difference (P = .027) in antibody titer to L pneumophila serogroup 1 (Lp1) between MWs and non-manhole workers, a multivariate logistic regression analysis showed a significant association between antibody against Lp1 and both age group and the practice of aquatic sports.
CONCLUSION: Although further investigations will be performed to quantify the risk of acquiring legionellosis, this preliminary study demonstrates for the first time the presence of Legionella, including human pathogenic species, in a working environment such as TM.
METHODS: Three hundred fifty-three environmental samples were collected from 100 TMs, and serum antibody titer against Legionella pneumophila and Legionella species non-pneumophila was determined from both MWs and control non-manhole workers.
RESULTS: L pneumophila and Legionella species non-pneumophila were detected in 28% of water samples, in 8% of the biofilm, and in 6% of sediment matrices taken in TMs, in a concentration range of 10(2) to 10(4) colony-forming units/L. No Legionella was found in TM air samples. Although there was a statistically significant difference (P = .027) in antibody titer to L pneumophila serogroup 1 (Lp1) between MWs and non-manhole workers, a multivariate logistic regression analysis showed a significant association between antibody against Lp1 and both age group and the practice of aquatic sports.
CONCLUSION: Although further investigations will be performed to quantify the risk of acquiring legionellosis, this preliminary study demonstrates for the first time the presence of Legionella, including human pathogenic species, in a working environment such as TM.