A strong natural immune system tends to assure that you will still be asymptomatic, and treatable, at that time. As with any threat, avoidance is the best response. If one can avoid anthrax expsoure then so is the threat of death avoided. Unfortunately an R.S.V.P. is unlikely. In the case of anthrax the next best is pharmaceutical antibiotics if treatment begins early enough.
Vaccines can offer protection if indeed it is the proper type.
Selection of the proper vaccine is very important here. There are three types of anthrax vaccines in this world. One is made by a Michigan firm, another by Colorado Serum, and yet another by the old Soviet Regime. The first two are the only ones available to Americans. The 'Michigan' anthrax vaccine has been in the news lately as being subject to FDA raids.