Thanks for posting this - this is really important, I hope alot of people read this thread!
Parvo showed up in our area a year ago, the humane society was shut down for 6 weeks. I do know someone from the dogpark who lost a dog to it - she worked at the shelter. fortunatly her other dog survived, though he got ill, too.
It's so important to keep vacinnes & health care up to date.