http://www.emedicine.com/med/topic1648.htm
I presume it is Norwalk virus, similar to what is causing the problem in the Cruise ships.
There is an outbreak of something in East Texas, but don't know if they have the cause yet.
We've been seeing three or four cases a week here. I couldn't find reports on the Texas Public health web site, but I expect a report on the MMR in the near future. Right now, they are more worried about West nile virus and influenza.