My opinion is that Crohnnies cannot mount a proper immune response. Obviously, Crohn's patients already have an autoimmune dysfunction of sorts, and in my view shots are intentional autoimmune modulations. Much controversy surrounds the findings that MMR antigens are found in the gut mucosa, oftentimes in Autistic kids--who often have Crohn's like disorders simultaneously. I, personally, think that vaccines could overtax the already fragile immune system of Crohn's patients in unpredictable ways. Ask/research whether a Crohn's patient has ever died/became seriously ill from the common flu.
I, personally, don't think that getting the flu shot would protect anyone against the constantly mutating/recombining nature of flu viruses. By the time a vaccine is made, the virus has mutated. Then there is the fact that companies still put Thimerasol in seasonal vaccines--in addition to other "preservatives" (formeldehyde compounds, aluminum salts, even MSG in nasally delivered attenuated/live flu vaccines).
Foreign DNA from eggs/fetal cells/larvae cultures/dog kidneys etc. are often not clarified out as supposed by pharma companies. This foreign DNA can contain cancer viruses, as was the case with Jonas Salk's praised polio vaccine (google SV40 in polio vaccine). The actual product inserts with all the fine print concerning the complete ingredients lists and side effects, often only seen by doctors, reveal the full extent of problems inherent in modern vaccines.
Intravenous exposure to anything is not a natural, nor understood, way to illicit immunization--think newborns subjected to hepatitus vaccines (unless the baby is exposed to dirty needles or unprotected sex, this makes no sense). How and why some injections may gravitate to the bowel followed by neuro-immuno cascading responses along the way, remains a mystery to me. Most doctors, pediatricians especially, are not thoroughly trained in neuro-immunology or environmental toxicity etc. in my opinion.
As with every other institution in society, currently being centralized under unaccountable corporatist global "authorities" following each "emergency" that crosses borders, corruption precludes any beneficent social function offered under the auspices of healthcare, as well.
Again, I better quit now. TMI, I'm sure. I'm very opinionated on the subject, as well as factual. I hope this gives you something to think about, people are very polarized on this subject and some people don't want to know too much.