Ok, despite what the Purell Customer service agent said, Purell does kill viruses. Here is the "abstract" (summary) of a recent article on this from the American Journal of Infection Control:
http://*******.com/yxn49j
The virus in this study is similar to a class of viruses (noroviruses) that cause outbreaks of vomiting.
Here is another study that says alcohol-based sanitizers work for some, but not all, viruses:
http://*******.com/y38n4h
So, hand sanitizer should help. But, considering the risk of aerosol transmission of the virus, I'd also be wary of eating anyplace where someone had just visably gotten ill (that's a euphemism for "threw up.") If it happens again near me, I'm throwing the food away.
Edited to add: Yikes, it looks like the DISboards don't allow links to Tiny Url.com You can replace the asterisks above with the words Tiny Url (omit the spaces.) Or, just do the search that I did -- go to
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed
and search for
isopropanol viruses (Purell is actually ethanol, not isopropanol, but if you search on ethanol, you get a lot of irrelevant stuff.)