The following table lists the etiologies of illness associated with drinking wat

Question

The following table lists the etiologies of illness associated with drinking water in 2002.

Agent

Number of Cases

Norovirus

727

Legionella spp.

80

Copper poisoning

30

Campylobacter jejuni

25

Giardia intestinalis

18

Cryptosporidium hominis

10

Escherichia coli O157:H7

2

1) Which of the water samples would have shown a high coliform count? Explain why.

2) Which etiologies could have been detected by membrane filtration? Explain why.

3) Which etiologies could have been detected by membrane filtration? Explain why.

Agent

Number of Cases

Norovirus

727

Legionella spp.

80

Copper poisoning

30

Campylobacter jejuni

25

Giardia intestinalis

18

Cryptosporidium hominis

10

Escherichia coli O157:H7

2

Explanation / Answer

Ans 1: Escherichia coli O157:H7 will show a high count of coliform because the rest of the samples pertain to inorganic chemicals, virus or other bacteria.

Ans 2: All etiologies except, Copper poisoning, Norovirus and Giardia intestinalis, by virtue of them being inorganic chemical, virus or other bacteria not feasible for isolation using membrane filtered samples.

Ans 3: ?Question is same as Q2.

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