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|
MONTH
|
Mean MPN/100 ml
|
|---|
|
INFLUENT
|
EFFLUENT
|
UPSTREAM
|
DOWNSTREAM
|
|---|
|
Enterococcus
|
(n = 15)
|
(n = 15)
|
(n = 15)
|
(n = 15)
|
|---|
|
May (n = 8)
|
2.90E+ 05
|
4.30E+ 03
|
4.08E+ 03
|
2.33E+ 03
|
|
June (n = 8)
|
3.89E+ 05
|
4.70E+ 02
|
1.73E+ 04
|
2.10E+ 03
|
|
July (n = 12)
|
9.67E+ 05
|
1.03E+ 03
|
2.85E+ 04
|
6.16E+ 03
|
|
August (n = 8)
|
1.75E+ 06
|
3.33E+ 03
|
1.99E+ 04
|
1.59E+ 03
|
|
September (n = 8)
|
3.19E+ 06
|
2.62E+ 03
|
2.04E+ 04
|
3.87E+ 03
|
|
October (n = 8)
|
2.53E+ 06
|
2.60E+ 02
|
4.73E+ 04
|
2.95E+ 03
|
|
November (n = 8)
|
2.60E+ 06
|
5.45E+ 03
|
6.39E+ 04
|
1.91E+ 04
|
|
Arithmetic mean (Overall)
|
1.63E+ 06
|
2.39E+ 03
|
2.87E+ 04
|
5.50E+ 03
|
|
Geometric mean (Overall)
|
1.12E+ 06
|
1.36E+ 03
|
1.66E+ 04
|
3.42E+ 03
|
|
E. coli
|
|
May (n = 8)
|
2.19E+ 06
|
1.15E+ 03
|
2.04E+ 04
|
4.81E+ 03
|
|
June(n = 8)
|
1.80E+ 06
|
2.60E+ 02
|
2.73E+ 04
|
3.72E+ 03
|
|
July (n = 12)
|
4.38E+ 06
|
4.43E+ 02
|
4.56E+ 04
|
7.52E+ 03
|
|
August (n = 8)
|
3.62E+ 06
|
1.34E+ 03
|
4.26E+ 04
|
5.33E+ 03
|
|
September (n = 8)
|
4.84E+ 06
|
5.09E+ 03
|
1.05E+ 05
|
2.22E+ 04
|
|
October (n = 8)
|
4.84E+ 06
|
2.80E+ 03
|
1.34E+ 05
|
7.22E+ 03
|
|
November (n = 8)
|
4.84E+ 06
|
5.29E+ 03
|
2.46E+ 06
|
4.20E+ 04
|
|
aArithmetic mean (Overall)
|
3.83E+ 06
|
2.21E+ 03
|
3.81E+ 05
|
1.29E+ 04
|
|
Geometric mean (Overall)
|
3.39E+ 06
|
1.15E+ 03
|
5.75E+ 04
|
7.46E+ 03
|
- a This mean was used to compute the risk of infection; n = number of samples collected/month, i.e. a single 500 ml sample was collected every 2 weeks from 4 sample sites to yield 8 samples per month except in July where samples were taken thrice to yield 12 samples. NB: the same samples were used to isolate E.coli/Enterococcus, total number of samples used was 60
