Rare chemical a problem for some people

Some people may be more vulnerable to contaminants in drinking water than the general population. This may be a result of a weakened immune system due to chemotherapy treatment, organ transplants, HIV/AIDS, or other immune system disorders. Some elderly people and infants also can be at high risk.
For people who are immuno-compromised, one contaminant of particular concern is Cryptosporidium. This microscopic organism can cause life-threatening infection for people at risk, although it...

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