Transmission of Parvo Virus?

I don't think there's any way to disinfect the yard.

In the house, the carpet will have to be shampooed or steam cleaned. The sofa will have to be cleaned if he was on it.

Then think where else he's been. Was he on the kitchen or bathroom floor? Did he play with the Husky's toys? Did he drink from her food or water bowl? All of those things will have to be cleaned.

As you can see, it will be nearly impossible to ensure the Husky and yet-to-be born pups are not exposed. All you can do is try.

In the future (and for anyone else reading this) never, ever, ever bring a puppy into a home with other dogs until the puppy has had his entire series of shots.

Never expose a pregnant dog to a puppy that may not have had ALL of its shots. If you have dogs and are planning on bringing a new puppy home, make sure your own dogs are up-to-date on all shots. And never take home a puppy from a breeder you aren't sure about or that looks sick or whose littermates look sick.

(Note: I'm not saying you did any of these things, but many people still do, so I feel it's important to point this out again.)