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From: Wilderness and Environmental Medicine: Vol. 8, No. 2, pp. 96100.

Efficacy of iodine water purification tablets against Cryptosporidium oocysts and Giardia cysts

CHARLES P. GERBA, PhD; DANA C. JOHNSON, PhD; MICHAELA N. HASAN, MS

Department af Soil, Water, and Environmental Science, the University of Arizona, Tucson, AZ 85721,

This statement sums up the testing:   These data strongly suggest that iodine disinfection is not effective in inactivating Cryptosporidium oocysts in water. Because this organism is common in all surface waters, it is recommended that another method of treatment be used before ingestion.

Cryptosporidium protozoa are just as common as Giardia, cause about the same symptoms, and are real tough to kill with chemicals.  Katadyn Micropur tablets have also been tested at University of Arizona and kill Cryptosporidium, within 4 hours, even in very cold and dirty water.

Although both Giardia and Cryptosporidium are relatively common, symptoms can be quite severe------ as per the following table.

Table 2. Symptoms of 205 patients with confirmed cases of cryptosporidiosis during the Milwaukee outbreak


Symptom

Percent(%)


Watery diarrhea

 93%

Abdominal Cramps

                           84%

Weight Loss (Median 10 lbs)

                           75%

 Fever---- Median 100.9 F.,  range: 98.7-104.9 F.

                           57%

Vomiting

  48%

1.    MacKenzie WR, Hoxie NJ, Proctor ME, Gradus MS, Blair KA, Peterson DE, et al. A massive outbreak in Milwaukee of Cryptosporidium infection transmitted through the public water supply. N Engl J Med 1994;331:161-7.