<prompt> Active immunity is not acquired by ?InfectionVaccinationImmunoglobulin transferSub-clinical infection  <response>: Ans. is c i.e., Immunoglobulin transfer Acquired immunity is of two types :? 1 Active immunity . It is so called because hosts immune system actively produce immunity. . Antigenic stimulus induces the immune system to produce antibodies or cellular immune response. 2 Passive immunity . It is so called because antibodies are produced in another organism and then received passively by the host. 