Anybody know of anyone else allergic to raw onion?

My father is affected. It's not life threatening, but it makes him violently ill - I've literally seen him go green. Once purged, he's OK, takes a little while to recover though. Cooked onions are fine.

He was in hospital a few years ago after some major heart surgery. They give you a form to fill in in the UK where you can tell the staff about allergies, he also informed the nurses and doctors verbally. They'd still bring him things with raw onion even though he was in a very weakened and poorly state .

I feel desperately sorry for people who's allergies are deadlier. You'd think a hospital of all places would be able to understand how serious they can be.