Primary and secondary are considered to be two responses of immune to the antigen.
Primary response occurs at the first encounter between the antigen and immune. This response can be as long as 14 days depending on the antigen category.
There are two cells in the body that act as a defensive system and antibodies against antibodies.
the secondary response occurs when a person exposed to the same antigen repeatedly
They attempted to stimulate "<span>primary demand".</span>
The definition of primary demand advertising in simple words
can be that any type of marketing which inspires the actual demand of the
object. This tells people who consume the product the benefits of the whole
product class.