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Cryptosporidium oocysts in a water supply associated with a cryptosporidiosis outbreak.

Howe AD, Forster S, Morton S, Marshall R, Osborn KS, Wright P, Hunter PR - Emerging Infect. Dis. (2002)

Bottom Line: The oocysts' persistence in the water distribution system after switching to another water source was also unusual.This persistence may have been due to oocysts being entrapped within biofilm.Despite the continued presence of oocysts, epidemiologic evidence suggested that no one became ill after the water source was changed.

View Article: PubMed Central - PubMed

Affiliation: East Lancashire Health Authority, Nelson, United Kingdom.

ABSTRACT
An outbreak of cryptosporidiosis occurred in and around Clitheroe, Lancashire, in northwest England, during March 2000. Fifty-eight cases of diarrhea with Cryptosporidium identified in stool specimens were reported. Cryptosporidium oocysts were identified in samples from the water treatment works as well as domestic taps. Descriptive epidemiology suggested that drinking unboiled tap water in a single water zone was the common factor linking cases. Environmental investigation suggested that contamination with animal feces was the likely source of the outbreak. This outbreak was unusual in that hydrodynamic modeling was used to give a good estimate of the peak oocyst count at the time of the contamination incident. The oocysts' persistence in the water distribution system after switching to another water source was also unusual. This persistence may have been due to oocysts being entrapped within biofilm. Despite the continued presence of oocysts, epidemiologic evidence suggested that no one became ill after the water source was changed.

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Date of diarrhea onset, 58 cryptosporidiosis cases, Clitheroe, 2000.
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Figure 1: Date of diarrhea onset, 58 cryptosporidiosis cases, Clitheroe, 2000.

Mentions: Fifty-eight cases met the case definition. Of these, three were in patients who had traveled abroad for <7 days in the 2 weeks before illness. Fifty-one cases were identified as primary, and seven as possible secondary. The dates of onset of cases (Figure 1) showed peaks on March 10 and 17. Ages of patients ranged from 7 months to 95 years, but most patients were <5 years (52%). Thirty (52%) of the patients were male and 28 (48%) female. All 58 patients (100%) had diarrhea; 18 (31%) had fever, 48 (83%) abdominal pain, 19 (33%) vomiting, and three (5%) blood in the stool.


Cryptosporidium oocysts in a water supply associated with a cryptosporidiosis outbreak.

Howe AD, Forster S, Morton S, Marshall R, Osborn KS, Wright P, Hunter PR - Emerging Infect. Dis. (2002)

Date of diarrhea onset, 58 cryptosporidiosis cases, Clitheroe, 2000.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3369585&req=5

Figure 1: Date of diarrhea onset, 58 cryptosporidiosis cases, Clitheroe, 2000.
Mentions: Fifty-eight cases met the case definition. Of these, three were in patients who had traveled abroad for <7 days in the 2 weeks before illness. Fifty-one cases were identified as primary, and seven as possible secondary. The dates of onset of cases (Figure 1) showed peaks on March 10 and 17. Ages of patients ranged from 7 months to 95 years, but most patients were <5 years (52%). Thirty (52%) of the patients were male and 28 (48%) female. All 58 patients (100%) had diarrhea; 18 (31%) had fever, 48 (83%) abdominal pain, 19 (33%) vomiting, and three (5%) blood in the stool.

Bottom Line: The oocysts' persistence in the water distribution system after switching to another water source was also unusual.This persistence may have been due to oocysts being entrapped within biofilm.Despite the continued presence of oocysts, epidemiologic evidence suggested that no one became ill after the water source was changed.

View Article: PubMed Central - PubMed

Affiliation: East Lancashire Health Authority, Nelson, United Kingdom.

ABSTRACT
An outbreak of cryptosporidiosis occurred in and around Clitheroe, Lancashire, in northwest England, during March 2000. Fifty-eight cases of diarrhea with Cryptosporidium identified in stool specimens were reported. Cryptosporidium oocysts were identified in samples from the water treatment works as well as domestic taps. Descriptive epidemiology suggested that drinking unboiled tap water in a single water zone was the common factor linking cases. Environmental investigation suggested that contamination with animal feces was the likely source of the outbreak. This outbreak was unusual in that hydrodynamic modeling was used to give a good estimate of the peak oocyst count at the time of the contamination incident. The oocysts' persistence in the water distribution system after switching to another water source was also unusual. This persistence may have been due to oocysts being entrapped within biofilm. Despite the continued presence of oocysts, epidemiologic evidence suggested that no one became ill after the water source was changed.

Show MeSH
Related in: MedlinePlus