What is the principle of immunization based on?

Step-by-step solution

Active immunity is slow and takes time to give its full effective response when a host is exposed to antigens.Passive immunity is the term used for the process of injecting ready-made antibodies to protect the body against foreign agents.Colostrum is the yellowish fluid secreted by the mother during the initial days of lactation The principle of immunization or vaccination is based on the property of ‘memory’ of the immune system, where vaccines introduced into the body generate memory B and T-cells that recognise