She doesn't have much time. If there is blood in her poop, it is important that you get her to a vet or start her on the medicine as soon as you can.
There is something called infectious anemia in chickens which is like parvovirus but is not. Birds are very different from mammals and this is very unlikely to be a danger to your family, particularly if you wash your hands and keep clean. Having just read most of a chicken health book, I think the only specific serious illness to be concerned about is bird flu, which is not what your chicken has.
At the vet's office, they disinfect the whole treatment room after a dog with parvo comes in. This is not that.
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