Aneesh, I've seen instances of serial deaths in a Parvo-active houses. A person in this same blog mentioned he brought atleast 3 puppies in his house, all died subsequently due to this Virus. It was only on the intervention of a vet that it was revealed Parvo was the killer. Bleach is a home-made remedy for killing the virus but if you seek help from a Vet s/he should be able to assist you better in dealling with this situation. Immunity is build gradually. That's why these vaccinations are followed by boosters.
I'd suggest you to abondon the plans of bringing in any puppy until you've get rid of this virus completely.