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Did they really ban white coats?

http://blogs.wsj.com/health/2009/06/16/ama-the-white-coats-a...

Personally I don't get it. If white coats harbour diseases, doesn't it follow that whatever else they wear will have the same problem? Presumably one of the reasons coats were white were to show up dirt so that they would be washed more promptly. In what way is wearing a black t-shirt (or whatever) more hygienic?

I think scrubs get washed much more often than white coats. That makes them more hygienic.
So by what mechanism EXACTLY do white coats transmit infection?
... why was that downvoted? I was just curious as to the details; it's mentioned several times but not explained.