[[Scientist]]s think both [[gene]]s and the [[environment]] have something to do with it. Normally, your immune system fights [[germ]]s. It is your body's defense system. In most allergic reactions, however, it is responding to a false alarm. | [[Scientist]]s think both [[gene]]s and the [[environment]] have something to do with it. Normally, your immune system fights [[germ]]s. It is your body's defense system. In most allergic reactions, however, it is responding to a false alarm. |