I had a bad reaction to a Tetanus injection after I had had a road accident. I am therefor not allowed to give blood, in case I sensitize the recipient of my donation. Similarly, more recently I had a near death experience because of the inclusion of Sodium Metabisulphite as a presevative in pain killer medicine I was prescribed after a heart operation. I now have to be very carerful about reading the labels of any foods I buy because I have become sensitized to it, even something as innocuous as Branston Pickle in a cheese sandwich can set me off and confine me to bed for a couple of days. Not all Nut Jobs are actually Nut Jobs, some of us have reasons to beware.