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From now on, military health workers will shove that needle a little deeper when administering anthrax vaccinations - but that extra pinch should prevent more pain later.A study that appeared in the Journal of the American Medical Association in October found that injecting the vaccine into a muscle rather than into the fat just under the skin greatly reduced side effects, including warmth, itching, redness, inflammation or nodules. Itching went from 23 percent of male volunteers to 5 percent when they were injected intramuscularly. Redness and inflammation went from 74 percent of male patients to 29 percent of male patients. Pain, however, went up about one percent.