E10_CEE_B_Lec09

E10_CEE_B_Lec09 - Infectious Agents viruses bacteria...

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Infectious Agents • viruses • bacteria • protozoa • helmints
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Infectious Agents • viruses • hepatatis • polio • rotavirus • Coxsackie • adenovirus
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Infectious Agents • bacteria Bacillus anthracis anthrax Vibrio cholerae cholera Salmonella typhi typhoid Shigella sp. dysentery
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Infectious Agents • protozoa • amoebae Entamoeba hystolitica dysentery Giardia lamblia Cryptosporidium parvum
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Drinking Water Regulations • coliforms – < 2 - 5 % positive samples (100 ml) • turbidity – < 0.5 NTU or 80% removal • Giardia removal – 99.9% removal (surface water) – treatment technique • virus removal – 99.99% removal (surface water) – treatment technique
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Enumeration/Detection • serial dilutions – Most Probable Number MPN 10 ml
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Most Probable Number
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Enumeration/Detection
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Siméon Denis Poisson 1781 -1840
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Poisson and Binomial Distributions 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0 2 4 6 8 10 12 14 k P(k) Poisson Binomial N=6 N=8 N=12 N=40   n p p p C n k P k e k P k n k n k binom k 1 ) , ( !
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E10_CEE_B_Lec09 - Infectious Agents viruses bacteria...

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