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I'd rather have my doctor wear a tshirt than wear a tie: ties are known to spread infection. http://abcnews.go.com/Technology/story?id=99526&page=1

I suspect the same could be true with long sleeves.

Noses and hands also spread infections, I don't want my doctor to have them either.

Poor hand hygiene is a huge cause of preventable, hospital-acquired infection. See http://www.who.int/gpsc/5may/tools/who_guidelines-handhygien... (pdf).