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 200,000 doses. Severe allergic reactions can occur after any vaccination, less than once per 100,000 doses. No data collected to date shows any patterns of adverse events developing years after people have been vaccinated with anthrax vaccine or any other vaccine.