Talk:Booster Shot/@comment-18323561-20160330125735/@comment-24.4.175.30-20160617161313

Vaccines use a dead sample of a pathogen in order to prepare the immune system for the identification and elimination of it. The only real inaccuracy (as mentioned above) is that they are only for preventing diseases and will not work (and will probably make the situation worse) if taken after the disease has been contracted.