DoD recommends that the vaccine be administered subcutaneously in the deltoid muscle tissue of the arm. It is also important that the doses are given in alternate arms each time. There is actually a diagram of the proper method in the Health Care Provider's Briefing located on our web site. I am including a hotlink so that you can take a look at the picture yourself. Like all vaccines, anthrax vaccine may cause soreness, redness, itching, swelling, lumps and may feel warm to the touch at the injection site.
Lumps can persist a few weeks, but eventually disappear.
Injection-site problems occur about twice as often among women. Larger reactions occur in about one in a hundred vaccine recipients. Again, these symptoms usually go away after a few days. Serious events, such as those requiring hospitalization, are rare. They happen about once per 50,000 doses.