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As far as we know CD is not an infectious disease.  I have had only one
husband/wife pair with celiac disease and have never seen unrelated
adopted children both get it. If anyone has experience of that finding
please e-mail me post it.  There is certainly conflicting evidence on
whether a infection triggers the presentation( not necessarily the start
of the disease) in a genetically predisposed person. Not all of the cause
is genetic in that 3 out 4 identiacl twins will have the diseae but not
all pairs.  Joe Murray