<<Disclaimer:  Verify this information before applying it to your situation.>>

Celiac patients may be prone to certain bacterial infections,  This risk
relates to functioning of the spleen that may be defective.  The spleen
is important in the response to certain bacteria especially
pneumococcus.  Older celiac should discuss with their Dr. about whether
they should get Pneumovax which might help protect against this type of
infection.

another situation is IgA defeciency which a specific type of defeciency
in one type of antibodies which affects about 2-3 % of celiacs.  The
presence of this antibody defect can make that individual more
susceptible to infections also.  It can be detected by measuring the
level of IgA in the blood.  I also leads affected individuals with a
greater chance of giardia infections in the bowel that can cause celiac
like damage (usually less severe and mostly short term).

Joe murray