How do i know when parvo has left my puppies?

Hey both my puppies had parvo or well have parvo they were diagnosed on the 17th so last thursday and i couldnt afford hospitilization of $7000 each so i did everythign i could at home they said their survival rate woul only be %15 but looky here their both llive and well.Since monday they have been playing fighting,no vomit, a little diahrea,want to go for walks,happy ,no signs of depression,They eat regularly have been drinking on their own this whole time.The vet said their parvo was just prominent enough just to turn the dots very light blueSo how do i knwo when parvo has left their body without taking them to the vet as finances are limited.