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Volume 13, Number 1—January 2007


Correlation between Subtypes of Cryptosporidium parvum in Humans and Risk

Paul R. Hunter*, Stephen J. Hadfield†, Dawn Wilkinson*, Iain R. Lake*, Florence C.D. Harrison*, and Rachel M. Chalmers†Comments to Author 
Author affiliations: *University of East Anglia, Norwich, United Kingdom; †National Public Health Service for Wales, Swansea, United Kingdom;

Main Article

Table 2

Logistic regression model from case-control study (19) showing final model from original study and recalculated using only those strains with the ML1–242 polymorphism as cases*

Cases/variableCases, n (%)Controls, n (%)Odds ratio95% CIp value
All Cryptosporidium parvum strains
Touch or handle any farm animals
Yes24 (34)43 (11)2.6531.113–6.3230.028
Eat tomatoes
Yes24 (36)249 (50)0.3170.140–0.7190.005
Eat raw vegetables
Yes7 (12)157 (44)0.2220.086–0.5720.001
Only ML1–242 strains
Touch or handle any farm animals
Yes21 (43)43 (11)
Eat tomatoes
Yes17 (37)249 (50)0.4250.164–1.1040.079
Eat raw vegetables
Yes4 (10)157 (44)0.1410.042–0.4740.001

*CI, confidence interval. Also included in the models were age and Health Authority of residence.

Main Article