Eighteen of 300 patients suffered brain swelling, an apparent immune reaction to the vaccine.
Usually, this is the result of an immune reaction that destroys the islet cells.
Some people do have an immune reaction causing chronic (long-term) pancreatitis, which is very different from painful acute pancreatitis.
It works by introducing a protein whose surface resembles that of the malaria parasite, thus inducing an immune reaction.
People with celiac disease usually have a certain type of cell surface receptor that helps set off the immune reaction.
When gluten hits the gut in someone with celiac disease, it sets off an immune reaction which kills off the cells forming the inner lining of the small intestine.
The new study suggested that the antibody produced by the malfunctioning immune system might trigger a reaction which led to the destruction of these cells.
Lack of intrinsic factor may be due to an autoimmune reaction, in which your immune system mistakenly attacks the stomach cells that produce it.
Another theory is that the initial illness may have created an autoimmune reaction, causing the body's immune system to attack normal cells as if they were foreign substances.
I've now been told I have no allergy but chronic ordinary urticaria which basically means my immune system is rubbish and anything could trigger a reaction of various degrees at anytime.
BBC: Children with allergies 'being let down': Your comments
They believe it may be caused by the body's reaction to stress which effectively leads to the immune system becoming overloaded.
BBC: News | Health | Immune system blamed for Chronic Fatigue Syndrome
There was no adverse reaction to the drugs, and if my immune system weakens in later years there are encouraging signs that the therapy will help to counter that - and hopefully this will continue to keep me healthy.
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