This may just be an advanced symptom of the 'superbug' threat, but I put a lot of blame on idiots who run to the doctor for antibiotics at the drop of a hat, and the idiot doctors who prescribe them the same way... at the drop of a hat. Got the sniffles? Better go on antibiotics.
It's no surprise at all that viruses are mutating because of antibiotic overuse to become stronger and stronger. Yet so many people just plod on doing what they do.
http://pediatrics.about.com/cs/weekl...0702_ask_2.htm
http://www.drgreene.com/qa/antibiotic-overuse
http://www.petitiononline.com/Daiichi/petition.html
Keeping your hands clean is always a wise move, but with so many people putting their kids on antibiotics for every cold and flu they get we are effectively harming the entire human race.