You know, I disagree that we are spreading any illness - germs don't live long enough outside a friendly environment - but if we ARE spreading germs without getting sick, why do you think that is? Could it possibly be because we have built up immunities through our normal daily hygiene practices of "merely" thoroughly washing our hands with venue-provided soap and water, wherever we go, throughout our lives?
I do happen to be getting over a cold right now and - so what? I caught a cold. It happens. I've had colds before. I'll have more before I die.
I decided to do some Googling - I tried "norovirus, antibacterial products" and got some interesting results:
http://www.asm.org/Media/index.asp?bid=42835
In part "Handwashing is known to be one of the most effective ways to prevent the spread of germs and disease" and "In this study [by Emory University and, Norht Carolina State University] a known amount of norovirus was placed on the fingers of volunteers and allowed to dry. The investigators tested one common liquid antibacterial soap and one popular brand of an alcohol-based hand sanitizer to see how effective they were at removing the virus from the fingers compared to rinsing with water only.
They found that washing the fingers with plain water gave the greatest level of norovirus reduction, with an average of about 96% removal. Washing the fingers with an antibacterial liquid soap gave an average of about 88% removal. The alcohol-based sanitizer was not effective at removing the virus from the volunteers fingers and only resulted in an average removal of 46%. "
The information is out there, folks, and easy to find. I only quoted this one site because both schools involved in the study are respected institutions. There's more.