Which water treatment professionals are glad to encounter healthy, thriving Cryp-tosporidium oocysts? Lab workers-because the higher the quality of their experimental materials, the more likely they are to glean information that can be used in the battle against waterborne pathogens. Not all healthy Cryptosporidium oocysts and Giardia cysts are in laboratories giving their lives for science. These protozoa also occur in surface water that utilities use as raw water supplies. And despite the best efforts of conscientious professionals who keep the public's health uppermost in mind, Cryptosporidium oocysts sometimes survive the treatment process and are found in finished water.
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