Active Immunization 2
Active Immunization 2 : Medicine. The conferring of immunity through the introduction of an attenuated form of a virus; for example, the injection of cowpox virus to confer immunity to smallpox, or by the injection of a killed or inactivated virus. The principle is that the body, by learning to deal with a mild and harmless virus closely related to a more serious strain, or a dead or inactive virus, develops antibodies against the virulent, live or active virus
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