Skip to main content

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.