Lab #61 – Bacteriological Examination of Water: Qualitative Tests
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| Does a positive-presumptive test mean that the water is absolutely unsafe to drink? Explain. No, a positive presumptive test indicates that the water might be unsafe to drink but further testing is warranted. | show 🗑
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| What might cause a false positive presumptive test? | show 🗑
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| List three characteristics required of a good sewage indicator. | show 🗑
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| What enteric bacterial diseases are transmitted in polluted water? | show 🗑
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| show | Amoebiasis caused by E. histolytica, cryptosporidiosis caused by C. parvum, and giardiasis caused by G. lamblia.
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| Why don’t health departments routinely test for pathogens instead of using a sewage indicator? | show 🗑
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| show | Coliform bacteria are gram-negative, facultative anaerobic, non-endospore forming bacilli that ferment lactose to produce acid and gas.
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| show | Detect gas production from lactose fermentation.
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| How is Levine EMB agar used for the detection of coliforms? | show 🗑
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| show | To make a slide for Gram staining to confirm morphology (gram-negative bacilli).
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| Once the completed test establishes the presence of coliforms in the water sample, why might you perform the IMViC tests on these isolates? | show 🗑
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Created by:
michellevu