Skip to main content

Advertisement

Table 5 GI illness by swimming status and presence of F+ coliphage by 24-hour SPOT Assay and 5-hour CLAT Assay

From: Rapidly measured indicators of recreational water quality and swimming-associated illness at marine beaches: a prospective cohort study

  Number ill % AOR2(95% CI) AOR-trend3(95% CI)
F+ Coliphage Spot Assay 1
   Non-swimmer 87 4.90 ref  
   0.1, 0.7 39 6.74 1.52(0.98-2.36)  
   0.7, 24 64 8.47 1.699(1.12-2.57) 1.15(0.69-1.92)
F+ RNA Coliphage CLAT Assay
   Non-swimmer 87 4.90 ref  
   Absent4 39 6.69 1.18(0.74-1.88)  
   Present4 64 8.51 1.8(1.22-2.66) 1.55(0.9-2.66)
F+ DNA Coliphage CLAT Assay
   Non-swimmer 87 4.90 ref  
   Absent4 23 6.05 1.11(0.64-1.93)  
   Present4 80 8.38 1.69(1.16-2.47) 1.61(0.86-3)
  1. 1: Daily Geometric Mean, Plaque forming units per 100 ml estimated by Most Probable Number (MPN) Method
  2. 2: Adjusted Odds Ratio comparing exposed swimmers to non-swimming reference group
  3. 3: Adjusted Odds Ratio for a 1-log increase in coliphage on a continuous scale among swimmers
  4. 4: Swimmers exposed on days when coliphage absent or present by the CLAT assay