| Share | Cite. Naturally acquired active immunity occurs when the person is exposed to a live pathogen, develops the disease, and becomes immune as a result of the primary immune response.Artificially acquired active immunity can be induced by a vaccine, a substance that contains the antigen.A vaccine stimulates a primary response against the antigen without causing symptoms of the disease (see vaccination).rtificially acquired active immunity can be induced by a vaccine, a substance that contains the antigen. A vaccine stimulates a primary response against the antigen without causing symptoms of the disease (see vaccination).
Definition of âequanimityâ - English Dictionary. See all translations. uk â /Ëek.wÉËnÉªm.É.ti/ us â /Ëek.wÉËnÉªm.É.tÌ¬i/ formal. âº a calm mental state, especially after a shock or disappointment or in a difficult situation: He received the news of his mother's death with remarkable equanimity. Three years after the tragedy she has only just begun to regain her equanimity.
Equisetum (/ËÉkwáµ»ËsiËtÉm/; horsetail, snake grass, puzzlegrass) is the only living genus in Equisetaceae, a family of vascular plants that reproduce by spores rather than seeds.