Immunity by vaccination is: (A) Active natural, (B) Passive natural, (C) Active acquired, (D) Passive acquired
Answer is C. Active immunity occurs as a result of infection or by specific immunization and is usually associated with the presence of antibodies or cells having a specific action on the microorganism or on its toxin. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 109