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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 13 / 47

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Factors Influencing Disinfection Efficacy and Microbial Inactivation - Parasites

Parasite type, structure and composition:

Protozoan cysts, oocysts and spores

Some are very resistant to chemical disinfectants  

Helminth ova:  some are very resistant to chemical disinfection, drying and heat.

Strain differences and selection:

Disinfectant exposure may select for resistant strains

Physical protection:

Aggregation; particle-association; protection within other solids

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