Volume 11, Number 2—February 2005
Research
Sporadic Cryptosporidiosis Decline after Membrane Filtration of Public Water Supplies, England, 1996–2002
Stella Goh*, Mark Reacher†
, David P. Casemore‡, Neville Q. Verlander§, André Charlett§, Rachel M. Chalmers¶, Margaret Knowles#, Anthony Pennington*, Joy Williams*, Keith Osborn**, and Sarah Richards††
, David P. Casemore‡, Neville Q. Verlander§, André Charlett§, Rachel M. Chalmers¶, Margaret Knowles#, Anthony Pennington*, Joy Williams*, Keith Osborn**, and Sarah Richards††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.
