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Table 2 Environmental sources positive for Legionella bacteria

From: Restaurant outbreak of Legionnaires' disease associated with a decorative fountain: an environmental and case-control study

  Sources Samples
Potential environmental sources Number investigated Number (%) positive Number collected Number (%) positive
Case-patient homes 7 1 (14.3) 37 1 (2.7)
Cooling towers 43 24 (55.8) 116 68 (58.6)
Chillers 6 5 (83.3) 10 7 (70)
Swamp coolers and sumps 9 5 (55.6) 12 5 (41.7)
Decorative fountains and ornamental waterfalls 22 2 (9.1) 42 2 (4.8)
Municipal, local and industrial water sources 22 3 (13.6) 39 6 (15.4)
Supermarket misters 8 2 (25.0) 20 2 (10)
Whirlpool spa 1 0 (0.0) 2 0 (0.0)
Restaurant A     
   Fountain 1 1 (100) 4 4 (100)
   Other water sources 4 0 (0.0) 9 0 (0.0)
Total 123 43 (34.7) 291 95 (32.6)