Parvo Question

This subject is a bit of a discussion, lots of different answers, this is from literature my vet printed out and he gave to me. Its about 40 pages all together, and I will gladely foward it all to anyone that request it.. Here's what you need...
Indoor decontamination: indoors virus loses its infectivity within one month; therefore, it should be safe to introduce a new puppy within one month after the active infection has ended.
Outdoor decontamination: freezing is completely protective to the virus. If the outdoors is contaminated and is frozen, one must wait for it to thaw out before safely introducing a new puppy.
Shaded areas should be considered contaminated for seven months.
Areas with good sunlight exposure should be considered contaminated for five months.
Of course, the above presupposes that no decontamination steps(other than waiting) have been taken.
The best and most effective disinfectant against viruses (including parvoviruses) is BLEACH. One part bleach mixed with 30 parts water and is applied to bowls, floors, surfaces, toys, bedding, and anything contaminated that is colorfast or for which color changes are not important.
Hope this helps, I think 2 years is good, but disinfect to be sure..
If more info is needed I can get this literature to you somehow.