A primary immune response produces antibodies within five to ten days of exposure to antigens (option 2), and a secondary immune response produces antibodies within a day or two of a subsequent exposure to the same antigen (option 3).
A primary immune response may be defined as the initial encounter between the antigenic agent such as a virus or a pathogenic bacteria with the immune system, while a secondary immune response refers to subsequent encounters.
Therefore, with this data, we can see that the primary immune response involves the first exposure to the pathogen.
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