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Suspensions of oocysts and cysts were exposed to simulated global solar irradiation for different exposure times at a constant temperature of 40°C. Infectivity tests were carried out using mice. Exposure times of 10 h (total optical dose c. 30 kJ) rendered C. parvum oocysts noninfective. Giardia muris cysts were rendered completely noninfective within 4 h (total optical dose >12 kJ). These results demonstrate that SODIS is an appropriate household water treatment technology for use as an emergency intervention. J Appl Microbiol. 2006;101(2):453-63.