Transmission Route of Legionella pneumophila in Central Air Conditioning System / 环境与健康杂志

ABSTRACT

Objective To explore the transmission route of Legionella pneumophila in central air-conditioning system. Methods The environmental samples collected from four public places of Nanjing city were detected by nested-PCR and analyzed by phylogenetic analysis. Results The positive rate of Legionella pneumophila in sediment, cooling water, aerosol near cooling tower, dust in duct surface and indoor air were 100%(9/9),78.6% (11/14),25.4% (17/67),16.7% (2/12) and 17.3% (13/75), respectively. The nucleotide sequence similarities of Legionella pneumophila in cooling water and indoor air was more than 92%. Conclusion The main pollution source of Legionella pneumophila is cooling water and Legionella pneumophila can be transmitted to indoor air through central airconditioning system.