And as in natural immunity, should the disease-causing agent ever invade, the immune system is fully primed, ready to pump out antibodies to immobilize it.

• 当下回再有同样的病原入侵时，已经整装待发的免疫系统就可迅速释出大量抗体，制伏入侵病原，一如自然免疫的反应。