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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 7 / 47

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Factors Influencing Disinfection Efficacy and Microbial Inactivation

Microbe type:  Resistance to chemical disinfectants:

Vegetative bacteria:  Salmonella, coliforms, etc.:      low

Enteric viruses:  coliphages, HAV, Noroviruses:      Moderate

Bacterial Spores

Fungal Spores

Protozoan (oo)cysts, spores, helminth ova, etc.

Cryptosporidium parvum oocysts

Giardia lamblia cysts

Ascaris lumbricoides ova

Acid-fast bacteria:  Mycobacterium spp.

Least

Most

High

Resistance:

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