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In 1994, an outbreak of cryptosporidiosis occurred in a rural community in Washington State where water was supplied by two deep unchlorinated wells. Confirmed case-patients had a stool specimen containing Cryptosporidium parvum oocysts. Probable case-patients had diarrhea lasting > or = 5 days. Sixty-two households (68.1% of 91) responded to a survey. Eighty-six cases (15 confirmed, 71 probable) were identified, for an attack rate of 50.9% (86/169 residents). Drinking unboiled well water was associated with being a case-patient (relative risk, 1.84; 95% confidence interval, 0.89-3.82), and a significant dose-response relationship was found between water consumption and illness (P = .004). Water that was presumed to be treated wastewater from a piped irrigation system was found dripping along one well's outer casing, which was extensively rusted. Presumptive Cryptosporidium oocysts were found in well water and in treated wastewater. This investigation demonstrates that even underground water systems are vulnerable to contamination.
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
March 1996,
Annals of internal medicine,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
January 2005,
Scandinavian journal of infectious diseases,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
December 1991,
Epidemiology and infection,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
July 1998,
MMWR. Morbidity and mortality weekly report,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
August 1995,
Epidemiology and infection,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
January 2008,
Kansenshogaku zasshi. The Journal of the Japanese Association for Infectious Diseases,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
March 1996,
Communicable disease report. CDR review,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
June 2002,
Emerging infectious diseases,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
November 1973,
American journal of epidemiology,
M S Dworkin, and
D P Goldman, and
T G Wells, and
J M Kobayashi, and
B L Herwaldt
October 1998,
MMWR. Morbidity and mortality weekly report,
