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| valign="top" | moderate<ref name=cdcp07/>
| valign="top" | high<ref name=cdcp07/>
| valign="top" | not availablehigh
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Toxoplasma oocysts and cryptosporidium oocysts are highly resistant to chlorine disinfection <ref name=cdcp07/>). Chlorine alone should not be expected to inactivate these pathogens in drinking water.