Of course Biotin deficiency is a problem. This plays directly into the entire cytokine/vaccination concept that's been studied for over fifty years. The Merck's still has a few things right~.
At any rate, the last thing I would ever be doing personally these days is to eat much of anything raw, let alone chicken eggs. The Bird Flu is largely the result of the overall climate changes, in my opinion, the effects that such have had on the foods those chickens are fed. Just a personal opinion.