1. Laboratory of Environmental Microbiology; National Public Health Institute; P.O. Box 95 FI-70701 Kuopio Finland
2. Kanta-Häme Central Hospital; Hämeenlinna Finland
3. Anaerobe Reference Laboratory; National Public Health Institute; FI-00300 Helsinki Finland
4. Scottish Legionella Reference Laboratory; Stobhill Hospital; Balornock Road GB-G213UW Glasgow Scotland UK