Active immunity is obtained by

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(B) Active immunity is developed when the host's immune system produces antibodies in response to an encounter with antigens,such as living or dead mi

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Weakened germs infection

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(B) Active immunity is developed when the host's immune system produces antibodies in response to an encounter with antigens,such as living or dead microbes or other proteins.In the case of vaccination or natural infection,the body is exposed to weakened or killed pathogens (germs).This exposure triggers the immune system to recognize the pathogen and produce specific antibodies and memory cells,providing long-term protection.Therefore,active immunity is obtained by the infection of weakened germs or through vaccination.

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