Why does the Centers for Disease Control and Prevention (CDC) recommend that people with compromised immune systems boil their drinking water?
Neither chlorine, nor monochloramine, can destroy certain protozoans like Cryptosporidium if filtration is unable to remove them. Some people who have compromised immune systems may wish to use bottled water or to boil their water to make sure they are not exposed to pathogens that may be present in the water despite the use of disinfectants.
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