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Volume 11, Number 2—February 2005

Research

Sporadic Cryptosporidiosis Decline after Membrane Filtration of Public Water Supplies, England, 1996–2002

Stella Goh*, Mark Reacher†Comments to Author , David P. Casemore‡, Neville Q. Verlander§, André Charlett§, Rachel M. Chalmers¶, Margaret Knowles#, Anthony Pennington*, Joy Williams*, Keith Osborn**, and Sarah Richards††
Author affiliations: *Carlisle and District Primary Care Trust, Carlisle, United Kingdom; †Health Protection Agency, Cambridge, United Kingdom; ‡University of Wales, Aberystwyth, Ceredigion, Wales, United Kingdom; §Health Protection Agency Centre for Infections, Colindale, London, United Kingdom; ¶Singleton Hospital, Swansea, Wales, United Kingdom; #Cumberland Infirmary, Carlisle, United Kingdom; **United Utilities, Great Sankey, Warrington, United Kingdom; ††West Cumberland Hospital, Whitehaven, United Kingdom

Main Article

Table A2

Symptoms and duration of symptoms in case-patients

Characteristics n (%)
Before membrane filtration
After membrane filtration
Before and after membrane filtration
March 1, 1996–February 29, 2000 March 1, 2000–August 31, 2002 March 1, 1996–August 31, 2002
Symptoms
Diarrhea 153 (100) 22 (100) 175 (100)
Vomiting 94 (61.4) 10 (45.5) 104 (59.4)
Abdominal pain 110 (71.9) 18 (81.8) 128 (73.1)
Fever 69 (45.1) 9 (40.9) 78 (44.6)
Loss of appetite 68 (44.4) 18 (81.8) 86 (49.1)
Weight loss 56 (36.6) 17 (77.3) 73 (41.7)
Symptoms at interview 38 (24.8) 4 (18.2) 42 (24.0)
No symptoms at interview 115 (75.2) 18 (81.8) 133 (76.0)
Median days* symptomatic 9 10 9
Range 2–21 3–20 2–21

*Of patients without symptoms at interview.

Main Article

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