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Volume 11, Number 2—February 2005


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 A4

Speciation of Cryptosporidium isolates

Isolates n (%)
Before membrane filtration
After membrane filtration
Before and after membrane filtration
January 1, 1998–February 29, 2000 March 1, 2000–August 31, 2002 January 1, 1998–August 31, 2002
Total speciated 68 (100) 16 (100) 84 (100)
C. hominis 1 (1.5) 3 (18.8) 4 (4.8)
C. parvum 57 (83.8) 13 (81.2) 70 (83.3)
Not determined 10 (14.7) 0 (0) 10 (11.9)

Main Article