Types of Immunity
– Naturally Acquired
Passively – This could be due to the transfer of antibodies from the mother to the fetus across the placenta. No memory cells involved so it’s a short term solution.
Actively – Usually when the body is exposed to an infection it will manufacture its own antibodies to combat the infection, along with memory cells. Because of these memory cells the response time when exposed to the same infection again decreases.
– Artificially Acquired
Passively – Again no memory cells are made so it’s only a short term solution. It usually occurs when ready made antibodies are injected into the body to combat certain infections like tetanus, and is a help against diseases which are hard to build an immune response to.
Actively – This is achieved by a vaccine being given to a healthy human, the body is stimulated into producing antibodies and memory cells against this vaccine and thus building an immunity to the disease.

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