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Archive for March, 2010

The vaccination is a method of introducing an external agent (the vaccine) in an organism in order to create a positive immune response against an infectious disease. The active substance of a vaccine is an antigen to stimulate the body’s natural defenses (the immune system). The primary immune response allows a parallel implementation of memory antigen presented that in future, in a real infection, acquired immunity can activate more quickly. There are four types of vaccines in their preparation: inactivated infectious agents live attenuated, subunit of infectious agents or toxoids (the diphtheria, tetanus’s).

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Vaccine can be classified in to two kinds. The following is the classification of vaccine. The first is live attenuated vaccines. These vaccines composed of attenuated live microorganisms in the laboratory, to be able to multiply in the host organism so that it can occur at stimulating an immune response. This immune response attenuated microorganism is identical to that produced by natural infection because the immune system is unable to differentiate between infection and the wild vaccine microorganism. The multiplication of the microorganism vaccine is not usually capable of causing disease. The examples of live attenuated vaccines: Measles, mumps, rubella, polio, polio, yellow fever, varicella, BCG.

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