It basically means it won't spread through the population like the flu, which makes outbreaks easy to contain. Corpses need to be properly disposed of and you should avoid contact with the scabs or whatnot from people with anthrax lesions, but that's about it. There are cases of anthrax in livestock in America a few times a year but it's really not much cause for concern. It used to be far more common, but now livestock get vaccinated for it in regions where it's know to occur.