Acquired immunity can be naturally or artificially acquired.
Both passive and active immunity can be either naturally or artificially acquired. In this section we will look at artificially acquired immunity. a. Active artificially acquired immunity (def) Active artificially acquired immunity refers to any immunization with an antigen.2. During artificially acquired active immunity, one is immunized with one or more of the following: attenuated microbes, killed organisms, fragmented microorganisms, or antigens produced by recombinant DNA technology, or toxoids.ith artificially acquired active immunity, one is immunized with one or more of the following: 1. Attenuated microbes (see Fig. 1) Attenuated microbes (def) are living, non-virulent strains of a microbe.