If coliform bacteria are native to human colons, why the big concern over coliform contamination?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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If coliform bacteria are native to human colons, why the big concern over coliform contamination?

Table 4 MPN Index" (MPN Index Based on 95 Percent Confidence Limits)
Number of tubes giving positive reaction out of
Number of tubes giving positive reaction out of
5 undiluted
samples
(dilution
factor-1)
5 dilutions
of 10
(dilution
factor-10)
5 undiluted
samples
(dilution
factor-1)
5 dilutions
of 100
5 dilutions
of 10
5 dilutions
of 100
(dilution
factor-100)
MPN Index
MPN Index
(dilution
factor-100)
per
100 ml.
(dilution
factor-10)
per
100 ml
<2
1
26
2
3
27
2
3
33
4
34
1
5
23
1
30
1
1
4
40
1
1
5
30
1
6
1
1
50
4
5
1
60
2
7
50
70
9
5
2
90
2
9
5
3
80
2
3
12
3
110
3
3
140
1
11
5
3
3
170
3
11
5
130
14
170
3
14
220
3
17
5
4
280
13
5
4
350
1
17
240
1
17
5
1
300
21
5
500
1
26
900
2
22
4
1600
5
2 1600
*Multiply the MPN Index by the smallest dilution tactor from the series used when dilutions other than 1, 10, and 100 are used. Standard Methods for
the Examination of Water and Wastewater, 10th ed.
Transcribed Image Text:Table 4 MPN Index" (MPN Index Based on 95 Percent Confidence Limits) Number of tubes giving positive reaction out of Number of tubes giving positive reaction out of 5 undiluted samples (dilution factor-1) 5 dilutions of 10 (dilution factor-10) 5 undiluted samples (dilution factor-1) 5 dilutions of 100 5 dilutions of 10 5 dilutions of 100 (dilution factor-100) MPN Index MPN Index (dilution factor-100) per 100 ml. (dilution factor-10) per 100 ml <2 1 26 2 3 27 2 3 33 4 34 1 5 23 1 30 1 1 4 40 1 1 5 30 1 6 1 1 50 4 5 1 60 2 7 50 70 9 5 2 90 2 9 5 3 80 2 3 12 3 110 3 3 140 1 11 5 3 3 170 3 11 5 130 14 170 3 14 220 3 17 5 4 280 13 5 4 350 1 17 240 1 17 5 1 300 21 5 500 1 26 900 2 22 4 1600 5 2 1600 *Multiply the MPN Index by the smallest dilution tactor from the series used when dilutions other than 1, 10, and 100 are used. Standard Methods for the Examination of Water and Wastewater, 10th ed.
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