We saw a lot of Parvo cases at the clinic I worked at. Your yard is infected and only the sun and time will kill the virus eventually. Do not let anyone bring their pets over for a few months—even the dogs with the vaccinations will become carriers and take the virus home with them. Odoban [have seen it in Sams Club (gallon), WalMart and Ace Hardware (both quarts only in my area)] is good for the surfaces that can’t handle bleach.
You and your puppy are in my prayers. I’ve seen the weakest puppy survive and its much stronger litter-mate not make it.
In the yard, you can try a product called "Consan Triple Action 20" for disinfection. It kills mold and bacteria and is supposed to be effective against certain types of virus. It's intended as a lawn fungicide/algaecide, but the label indicates it is also a good laundry sanitizer; I use it with colored fabrics. Home Depot and Ace carry it.
Thanks