Active immunity is not acquired by which of the following ?: (A) Infection, (B) Vaccination, (C) Immunoglobulin transfer, (D) Subclinical infection
Answer is C. - Immunoglobulins - provide passive immunity Active immunity: - Protective response mounted by a person's own immune system after clinical / subclinical infection / vaccination. - Comprises humoral / cellular immune responses Passive immunity: - Ready-made protection against disease provided by introduction of preformed animal/ human antibodies into the human body Passage of IgG from mother to fetus through placenta Transmission of secretory IgA in breast milk Administration of Antisera