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Table 3 Legionella culturing and monoclonal antibody testing of potable water samples collected from an apartment complex for seniors (n = 103 samples)

From: Legionnaires’ disease case-finding algorithm, attack rates, and risk factors during a residential outbreak among older adults: an environmental and cohort study

Sample site

No. tested

No. (%) positive

  

Any Legionella*

L. pneumophila1 (1,2,3)**

Affected buildings (A-1 and A-2) †

  Water intake valves

11

6 (55%)

0

   A-1 apartments

21

21 (100%)

18 (86%)

   A-2 apartments

21

20 (95%)

13 (62%)

   Common areas

22

12 (55%)

0

Unaffected buildings (U-1 and U-2) †

  Water intake valves

8

1 (13%)

0

   U-1 apartments

7

4 (57%)

0

   U-2 apartments

7

6 (86%)

0

Fire hydrants

6

2 (33%)

0

  1. * Any Legionella includes L. pneumophila and other undetermined species of blue-white Legionella that typically are not pathogenic.
  2. ** L. pneumophila 1 (1,2,3) denotes serogroup 1, monoclonal antibody type Knoxville (1,2,3).
  3. † Cases occurred among residents and visitors of affected buildings A-1 and A-2 only.
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BMC Infectious Diseases

ISSN: 1471-2334

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