I am sorry to hear this has become a problem the virus is fairly easy to eradicate in the home but not so in the yard as it can live for months to years longer in cool dark areas.
You can try using bleach mixed 50/50 with water and clean all bleachable surfaces.
There is a really good disinfectant called parvo way that several of our clients have used.This can be used in the house and outside. You want to clean all furniture and wash any removable fabrics including drapes. Wash any walls the infected pup may have come in contact with and well as all floors and carpets
Here is a link to this product I believe it is sold several places on line
you want to treat the yard as well you can use a garden sprayer that you fill will product and hook to the hose. You can use the parvo way or bleach on the yard.If you are not worried about killing off the grass using the bleach would be best in the yard
You will want to treat the yard 2-3 times a month for 3 months.
Unfortunately we recommend not having vaccinated puppies in the home or yard for 6 months after a positive parvo exposure.
I hope this has been helpful,please reply back if you have additional questions or concerns