We are going into another area for a bit, due to the fact that there have been a lot of parvo cases seen locally in general, not within BDBH (knock wood)!
Some links so you can do your own reading:
Drs. Foster and Smith: Parvovirus: Serious Diarrhea in Puppies & Dogs
Merck Vet Manual Canine Parvovirus
Baker Institute at Cornell University Canine Parvovirus
Mar Vista Vet Canine Parvovirus