You raise some very important points.
1. Yes, it is possible to outgrow a mild peanut allergy in 25% of cases. However severe peanut allergies tend to persist into adult life.
2. There are 9 different peanut allergens in a peanut, some are associated with anaphylaxis (Ara h2 & Ara h6). Other peanut allergens are only associated with mild oral symptoms (such as Ara h8). The basic blood RAST test for peanut doesn't differentiate these, and its best to have these peanut IgE components individually tested.
3. Peanut desensitisation immunotherapy is a viable possibility these days and many paediatric allergologists are now desensitise peanut allergic children successfully. The process involves slowly inducing peanut tolerance by slowly introducing peanut incrementally. This should never be done at home but must always be done under medical supervision. Unsupervised it may result in life-threatening anaphylaxis.
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