A new study from Ireland of 95 doctor's ties found that 18% had pathogens recovered when cultured. S. aureus was recovered from 10 ties (8 of the isolates were methicillin resistant), gram-negative bacilli were recovered from 10 ties, and 3 ties had both S. aureus and gram-negative bacilli. The doctors also completed a survey, and 81% reported they would be happy not to wear a tie.
So to recap, we have an article of clothing that serves no function, is commonly contaminated with pathogens, and many doctors don't want to wear them. I think it's time to kill the necktie.