There is a vacination against it which helps protect dogs from it theres alot of it around and you often get almost out breaks off it where quite a few peoples dogs in the area get it it can be fatal especially in puppies and older dogs.
Hi here is a link that explains a little about it parvo
If you suspect that you have walked through an infected area, wipe off your shoes with one-part household bleach to 30 parts of water solution. Use the bleach/water solution as part of a general cleaning process of areas frequented by other dogs.
Just read on another thread that a young pointer was ill after Crufts and died from parvo shortly after. I'll try and find the link and see they'll allow me to cross post.