[Allergy and infections: a rediscovery for pathogenesis and therapy].

The relationship between allergy and infection is well known. However only the recent discover of the mechanisms underlie to allergic inflammation gave us the interpretative key to understand the reciprocal influence. In the onset of allergic diseases infections may play whether a predisposing or protective role, while in the induction of relapses, infections play the major role, priming the inflammation, which among allergic children immediately, switches in allergic inflammation.