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How primary immune response differ from secondary immune response?

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Primary Immune Response:

1. It occurs as a result of primary contact with an antigen.

2. Antibody level reaches peak in 7 to 10 days. 

3. Prolonged period is required to establish immunity. 

4. There is rapid decline in antibody level. 

5. It appears mainly in the lymph nodes and spleen.

Secondary Immune Response:

1. It occurs as a result of second and subsequent contacts with the same antigen.

2. Antibody level reaches peak in 3 to 5 days. 

3. It establishes immunity in a short time. 

4. Antibody level remains high for longer period.

5. It appears mainly in the bone marrow, followed by the spleen and lymph nodes.

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